Comic Book: Sonic The Hedgehog Mega Man Worlds Collide
At long last! The Blue Bomber Meets the Blue Blur
Doctor Wily: I don't suppose you know anything about bringing order and a better way of thinking to the world with your machines, Doctor?
Doctor Eggman: Oh, I do! And I don't suppose you have some young upstart who gets in your way and ruins everything, do you, Doctor?
Doctor Wily: Oh, you can't begin to imagine!... Or perhaps you can!
Doctor Eggman: Quite right! We need to meet, and I have an idea as to how...
For nearly twenty years now, Archie Comics has published the comic adventures of one Sonic the Hedgehog. Likewise, they have had similar success bringing Mega Man, the Blue Bomber, to the printed medium. Thus, it was only a matter of time before both titles, which are penned by Ian Flynn, came together in the form of a crossover —- the first Capcom vs. Whatever crossover to be produced in a medium other than video games.The story begins when, by chance, the blue Chaos Emerald —- thought to be gone missing in the world of Sonic after the events of the Sonic Genesis storyline —- is thrown through time and space into the world of Mega Man, where it is discovered by Dr. Wily and his forces. In an attempt to analyze its properties, Wily accidentally contacts the original owner of the emerald... Doctor Ivo Robotnik, aka "Eggman." Instantly sensing a connection, the two scientists conspire to use the Genesis Wave to rewrite both their realities and prime them for conquest, which they then intend to conquer together. Eager to collect the seven Chaos Emeralds, they manipulate Sonic and Mega Man into fighting one another. Can the two heroes come together in time to stop the evil doctors and set both their worlds right?Beginning in April, 2013, Worlds Collide is a twelve-part Crisis Crossover epic spanning the pages of Mega Man #24-27note Parts 1, 4, 7 and 10, Sonic the Hedgehog #248-251note Parts 3, 6, 9 and 12, and Sonic Universe #51-54note Parts 2, 5, 8 and 11. Archie has already announced trade collections for the crossover (well before the first part even came out. Though considering how spread out this story is across issues, it's not surprising), and each issue sports numerous themed variant covers as well.The 2004 fan-made Sprite ComicTwo Evil Scientists had a similar premise, but as far as we're aware none of the companies involved in this had any idea Two Evil Scientists existed.
Advertised Extra: Air Man appears on the cover for the series alongside all of the other main characters. His only role in the crossover is appearing alongside all the other Robot Masters in the big final battle.
A God Am I: Wily and Eggman are trying to literally invoke this.
All of Them: Over 90 Robot Masters from the classic Mega Man series make an appearance in the crossover.
Alternate Company Equivalent: Invoked on the "Rivals" variant covers, which features Sonic and Mega Man, Proto Man and Knuckles, and Bass and Shadow. In the comic itself, Metal Sonic is paired off with both Bass (as The Dragon to their respective doctors) and the Copy Robot (as Evil Knockoffs).
Anime Hair: Proto Man's pompadour. Especially if one considers how the heck it fits under his helmet in the first place.
Armor Piercing Name: In part nine, Dr, Light drops a name that causes Dr. Wily, in the throes of megalomaniacal gloating, to lose some color, his eyes to shrink to pinpricks, and his hair to wilt instantly.
Bash Brothers: Mega Man and Sonic for the duration of the crossover.
Beam Spam/Macross Missile Massacre: The Egg Wily Machine X has... a lot of lasers and explosives. Nowhere near enough to deal with Super Sonic and Super Mega Man though.
Beat the Curse Out of Him: In a way. The key to curing the Roboticized Masters involves hitting them with a Charge Shot and a Spin Dash. Later on, this process is combined into hitting them with the Spin Dash Blast.
Blob Monster: Chaos and the Yellow Devil get combined into the Chaos Devil. It's also a dangerous opponent, easily defeating Rouge, nearly overpowering Bass and Metal Sonic, and was gaining the upper hand against Sonic and Megaman before Duo stepped in.
Book Ends: Interestingly enough, the entire thing is split up into three acts, and each one begins and ends with an issue of the same comic brand, act 1 begins and ends with Mega Man, act 2 begins and ends with Sonic Universe and act three begins and ends with Sonic the Hedgehog.
Boss Rush: Practically the whole crossover. Mega Man and Sonic continually go straight from one boss fight right into another. By the time they actually end up facing the usual fortress traps and army of Mecha-Mooks, they seem to treat it as a well-deserved break more than anything else.
Brainwashed and Crazy: Heavily implied to be a side effect of plugging a Devil Core into living water (aka Chaos 0).
Brick Joke: In Mega Man #24, Wily is demanding that Ra Moon make him a Met that's part rice cooker. Several pages later, he and Eggman are happily eating from one together.
The Cameo: Imprisoned next to Doctor Light in Sonic The Hedgehog #249 is Snively, still locked up in a capsule by Eggman after his ruinous defeat in the Sonic Universe "Scrambled" story arc. Considering the note about comic-original characters in Cosmic Retcon below, his face is obscured by a glass glare.
Crabmeat and Reggae appear on page 9 of Mega Man #25 playing Go Fish with Orbot and Cubot.
The Cavalry: After Sonic disarms Mega Man in his home universe, Mega Man lures him back through a portal to his home city where he then summons Rush, Tango, Beat, and Eddie as backup.
At the end of Part 11, Sonic's and Mega Man's friends are cornered by the Robot Master horde and seem on the losing side. Then in Part 12, the MM1 robot masters enter the fray and turn the tide, courtesy of Roll.
Chekhov's Skill: The "Sonic Shot" was vital in restoring the Robot Masters. A Chaos Emerald-powered version where Megaman uses Sonic as a projectile defeats the Egg-Wily Machine X in one shot.
Child Prodigy: Tails is good enough to sub for Dr. Light after the latter is kidnapped by Bass and Metal Sonic.
Clueless Detective: Played with in the case of the Chaotix. They seem to need help finding the blatantly obvious at first, but they do manage to track down Proto Man before Wily or Eggman can do so with far greater resources.
Combination Attack: Used very often between Sonic and Mega Man. The first one manages to restore Tails Man back to normal. The final one (between Super Sonic and Super Mega Man) destroys the Chaos Emerald-powered Egg-Wily Machine X in one hit.
Also a bit subverted in that it continues on long after the heroes have gone on ahead, and by the end of Part 11, the Robot Masters are clearly winning. Then subverted yet again in Part 12 when the MM1 robot masters enter the fray and even things out.
Mega Man #25 has a scene where Mega Man is worrying about Dr. Light who was just kidnapped and Sonic is telling him to relax. Mega Man shoots back with "If it was your dad would you—?" before being cut off. Sonic has indeed spent many a past issue worrying over the fate of his own father.
In Sonic Universe #52, Sonic gets deja vu from fighting Buster Rod G, implying that he's halfway remembering Monkey Khan. He also derisively refers to Buster Rod as a Kiki, a kind of Badnik from Sonic Adventure.
During part 5, Sonic mentions being annoyed if he got jumped by a whale. While this is a reference to Sonic Adventure, it's also a hint that Sonic's remembering Akhlut, one of Eggman's henchmen from the regular comic.
In Part 9, after Wily gloats about the power of the Genesis Wave, Dr. Light reminds the two doctors of all the moments they have endangered or were potentially endangering themselves and/or the world. In Wily's case, he mentions Ra Moon, Gammanote Who Wily did keep control over, Gamma was still a possible threat to the world., King, the Stardroids, the Roboenza virus, and Bass. For Eggman, he refers to Chaos, the Space Colony ARK, Emerl, and the the Time Eaternote Despite the fact that the Time Eater is one of the few monsters to not turn against Eggman and its destruction of the time-space fabric was exactly what Eggman wanted it to do.
In Part 10, Mega Man asks whether Sonic had met with anyone from outer space, in which Sonic tells him about his experience with Wisps.
Earlier in Part 10, upon meeting the Mega Man Killers, Sonic mentions that all they need now is Silver Sonic.
Cosmic Retcon: The crossover is facilitated by Eggman and Wily using the Genesis Wave from the Sonic Genesis storyline to rewrite both their realities. In-universe, it allows them to prepare both their worlds to their liking, with the side-effect (as Word Of Godsays) of shifting the Mega Man timeline (along with Wily's memories) forwards to after a version of Mega Man 10. Out of universe, it allows Archie to suspend all currently-running story threads, temporarily exile nearly all comic-original characters on both sidesnote It should be noted that both doctors state that they can't use the Genesis Wave to wipe someone out of existence or fundamentally change who they are, so it can be assumed that they still exist in the altered timelines and simply won't be getting involved in the events of the crossover. (which new readers that are picking up the book for the first time would be not familiar with), make the world of Sonic be closer to the games (which new readers that are picking up the book for the first time would be more familiar with) and use Mega Man characters that haven't had a chance to appear yet in the main storyline.
It seems to have some strange (and rather creepy) effects in-universe. For one thing, most people are now suffering feelings of amnesia. Both Dr. Light and Silver note that they can physically tell that they're missing memories but can't discern why.
Duo reveals in Part 10 that the effect is growing and could have dire consequences if not stopped.
The crossover ends with the two heroes Chaos Controlling their respective worlds to restore them. The Mega Man universe more or less returns to its original status quo, with no one able to remember the crossover beyond vague recollections. The Sonic universe, meanwhile, will apparently have far more reaching alterations.
Crazy-Prepared: A meta example. After he began writing both comics, Ian Flynn went ahead and wrote up an outline for a crossover just on the off chance that he got to do one.
Subverted when Eggman throws Dr. Light out of the Wily Egg on the grounds that he's too clever to let live. Not only is Dr. Light rescued, but the act is what solidifies the breakdown in his and Wily's alliance.
Death Is Cheap: Because of the loose space-time laws of the Skull Egg Zone, Dr. Wily is capable of reviving all of his past Robot Masters, even the ones who were Killed Off for Real. And he can continue to revive them without end no matter how thoroughly they are destroyed.
Deflector Shields: Metal Sonic has the Black Shield, which helps him deflect Mega Man's attack.
The Egg-Wily Machine X also has one, able to deflect repeated attacks from Super Sonic. But not enough to take a Super-Charged Shot from Super Mega Man.
In the Off-Panel comic for Sonic Universe #54, Bass announces that he and Metal Sonic will combine their power, resulting in... a musical act. Mega Man thought they were going tofuse together.
Didn't See That Coming: Copy Robot, fighting Mega Man to a stalemate, gloats about how he can predict Mega Man's moves and tells him that MM has nothing new to bring to the table. However, he didn't know that Mega Man copied a new weapon from Tails Man...
Easy Impersonation: A rare justification. Eggman and Wily use doppelgangers of Mega Man and Sonic in order to pit the two against one another. What justifies it is the fact that Mega Man never gets a good look at Sonic's double (Metal Sonic in this case) due to him moving so fast - all Rock sees is a fast moving blue blur - and Sonic has to deal with the Copy Robot, who looks just like Mega Man to begin with.
Elemental Rock-Paper-Scissors: Just like in the Mega Man series, one Robot(icized) Master is weak to another one's weapon. Charmy Man is weak to the Acoustic Blaster, Vector Man's weapon. This weakness is also lampshaded by Mega Man.
"It's a long story, but Wily does it out of habit by now. Believe me, it comes in handy."
Even Evil Has Loved Ones: Subverted at the end of Sonic the Hedgehog #248. Hearing that Mega Man has a "father" is the first sign that makes Sonic realize the strange blue robot he's fighting might not just be another one of Eggman's robots.
Even Evil Has Standards: Subverted. Dr. Wily doesn't seem to agree with Tails lacking a personality after he's roboticized into Tails Man, but he doesn't care since he's more Eggman's minion than his. He presumably feels the same way about the other Roboticized Masters.
Later played straight in the third act as Wily is completely horrified that Eggman tried to outright kill Dr. Light, sowing further distrust between the two.
Faceless Goons: Amazingly averted considering the sheer number Wily and Eggman have available to them. While such foes are seen facing the heroes, more than 90% of the combat in the comic is against Boss-level foes.
Fastball Special: The final attack against the Egg-Wily Machine X has Super Megaman fire Super Sonic at the doctors as a supercharged shot. This destroys the machine in one hit.
Foreshadowing: In Part 10, Dr. Light mentions the one name that causes Dr. Wily to go into a panic: Ra Moon. He's the subject of the next storyline for Mega Man following this one and what he does just proves as to why Wily wants to wet his pants.
In the final part, as our heroes are getting ready to fix the worlds, Wily muses if they'll remember the events. So far, neither Wily nor anyone else in the Mega Man universe remembers.note aside from Wily having an urge to smash an egg carton and Mega Man having momentary concern for his world as he notices that his damage from Break Man was undone. As well, it seems that Sonic remembers the events, but no one else does.
Sonic Universe reveals that Blaze remembers the events for some reason, likely because she's from a different world than the rest of the cast, and Ixis Naugus is having violent flashbacks to the world as it was before the crossover.
Funny Animal: Most of the Sonic characters. It gets a couple of odd looks early in the crossover, but is otherwise not even commented on.
Funny Background Event: In one scene while Eggman and Wily discuss a development, Orbot and Cubot are playing cards. Orbot tells Cubot to "Go fish" and Cubot hops off with a fishing rod, and hops back dragging a large fish.
In Part 7 (Mega Man #26), when the heroes get ambushed by Blaze Woman and Silver Man and knocked down a waterfall, Tails has the unfortunate luck of crashing into a disappearing / reappearing platform before falling into the water.
In Part 8, after Knuckles and Amy are restored, a Met and a Chao-Met try to dig up a Burrobot who then dives back down. Rush and Tails even spot the event and go investigate the hole.
There's a nice little visual gag involving Sonic and Ring Man's Rings on one page in Part 9.
Part 9 has numerous funny background events involving the Robot Masters.
In Part 10, there's a point where Mega Man and Sonic are arguing over which doctor had more influence in building the Wily Egg where Rush and Tails look at each other with expressions of 'yep, they're gonna keep this up for a while'.
During the climax in Part 12, there's a spot where you can see Knuckles desperately grabbing Proto Man's scarf.
Genre Savvy: Both Wily and Robotnik have some great moments of this. Most notably both of them admit in their monologues that they're doubting the plan's chances of success and start planning to steal the Wily Egg and Egg Wily Machine X just in case everything goes bad.
Handshake Substitute: In Sonic the Hedgehog #248, Drs. Eggman and Wily do an Evil Bro Fist. In Sonic Universe #52 and Sonic Universe #54, their blue nemeses do the the same, but without the "Evil".
Hoist by His Own Petard: Rouge during her sneaking around the Wily Egg. She set about sabatoging the place with the help of Dr. Light. But in releasing the Chaos Devil to cause a distraction. It winds up attacking her while she fighting Metal Sonic which leads to her getting captured.
Both the doctors do this to each other in trying to sabotage the other during the battle against Knuckles and Proto-Man. Since they tampered with each others controls for the Egg Wily Machine X. It leaves them vulnerable to attacks and they quickly have to work to fix their sabotage as the heroes chip away at them.
Homefield Advantage: During their fight, Sonic manages to get the up on Mega Man when they're fighting in his world due to the geography. When they end up in Mega Man's world, he suddenly has access to all his allies, turning the battle in his favor.
How We Got Here: Mega Man #24 begin with Sonic and Mega Man about to throw down, and the rest of the issue and Sonic Universe #51 are dedicated to showing how they got to the point where they're at each other's throats.
Healing Factor: The Egg-Wily Machine X apparently has one, as all the damage done by Proto Man and Knuckles vanishes once the doctors reverse each others' Vehicular Sabotage.
Healing Shiv: As of Part 6, Mega Man has a weapon that reverses Robotization.
Jerk with a Heart of Gold: Sonic. He's an overall decent guy, but he enjoys getting under the skin of both friends and enemies with equal fervor. At one point he takes out a Robot Master that Shadow is fighting. Not because Shadow was in trouble, but because he knew it would piss him off.
Shadow counts too. He was originally all too willing to slay a downed opponent and leave the two heroes to their own devices, but when the need arose he stepped up and saved Dr. Light without hesitation.
Let's You and Him Fight: The first act of the crossover is dedicated to setting up an epic brawl between Sonic and Mega Man. It gets lampshaded in Mega Man #24's "Short Circuits" segment, where both title characters are eager to work together before being informed by Orbot that they have to follow the "crossover by-laws" and fight each other first.
Loophole Abuse: Mega Man does one on himself that is at least within spitting distance of Ass Pull territory in order to justify fighting Sonic before the two realize they are on the same side. Justified in that Mega Man's programming forbids him to harm life, so without the conclusion that Sonic's super-normal abilities mean he can't be biological (making Sonic fair game), there wouldn't be a throw-down between the two heroes in the first place.
MacGuffin: The Chaos Emeralds, in fine Sonic tradition.
MacGyvering: Tails is in fine form in Part 6 when he jury rigs Mega Man's Mega Buster with the properties of Sonic's Spin Dash so he can fire the Spin Dash Blast in place of his usual charged shot in the middle of combat versus three Roboticized Masters. In less than three pages.
Dr. Light could probably give MacGyver himself lessons. In Part 9 he builds a radio communicator from the guts of a Met and a Motobug that had been (ineptly) trying to kill him and in Part 10 he builds a fully functioning Mega Buster from damaged Robot Master parts. In less than a minute. While in the middle of a war zone. And holding a conversation at the same time.
Magitek: The Chaos Devil is a "Fusion of Magic and Machine".
Milestone Celebration: As the 250th issue of Sonic the Hedgehog, Part 9 primarily features a Big Badass Battle Sequence so massive that Ian Flynn described it as something along the line of "the moment I'll get death threats from the art team." It shows. Also, it includes a reprint of the ending of Sonic the Hedgehog #229, the end of the first usage of the Genesis Wave. The "Off Panel" comic is all about the milestone, for good measure.
Then there's the fact that Part 4 was the 25th issue of Mega Man and immediately prior to the crossover was the 50th issue of Sonic Universe that introduced the version of Metal Sonic that would show up in the crossover. Milestone celebrations all around.
More Dakka: E-123 Omega, who shows the heavily armed Napalm Man what this trope truly means.
A variant from Eggman in Sonic The Hedgehog #251: I Hate That Robot!
In Sonic the Hedgehog #251, the doctors' mutual betrayal takes the form of the 'B' and 'C' relays for the "Battle" and "Chase" programs on Wily's side and the circuit board marked "M.B.M." on Eggman's side.
Part three (Sonic the Hedgehog #248) reveals that it's not just the two of them, as reports of amnesia and missing memories have been reported all across Mega Man's world.
Never Say "Die": Subverted in part 10 with the Mega Man Killers. Not to mention the argument between Wily and Eggman over the latter's attempt to kill Dr. Light.
No Ending: Halfway. After Sonic and Mega Man beat Wily and Eggman, Mega Man's part in the storyline resolves nicely with the restoration of his universe. However, thanks to the Eggman's last ditch attack, Sonic's reality is irrevocably altered, thus forbidding any proper conclusion to the story arc for him. Still regardless, the story just kinda stops abruptly after the final battle.
One-Hit Kill: Played With as Mega Man's Spin Dash Blast is quickly shown to be able to restore the Roboticized Masters to their normal selves in one solid hit, and is the only thing that can, but landing that hit is often another matter entirely.
Played straight against the Egg-Wily Machine X. It's armor is too tough for even Super Sonic and Super Mega Man to do more than superficial damage against something that's already shown it can restore itself, but their Super Sonic Shot obliterates the machine completely.
One-Man Army: Sonic and Mega Man both qualify. As do their counterparts Metal Sonic and Bass.
One Shadow Limit: Subverted. There is Mega Universe's Shadow Man, and when Shadow The Hedgehog gets roboticized, his name also becomes Shadow Man. Played for Laughs when they both get sent out at the same time.
Opponent Switch: Mega Man and Sonic realize that fighting Bass and Metal Sonic is a delaying tactic and try to speed things up by doing this. Promptly subverted in that they get their asses kicked even harder when facing the other's usual opponent, forcing them to focus their efforts on one at a time instead.
Reality Ensues: In the big finale Sonic, Mega Man, and most of their allies face off against every single Robot Master except the original line. The fight begins... and soon the heroes are getting overwhelmed by the Robot Masters. Mook Chivalry is completely averted and the heroes start getting swarmed, especially after Sonic, Mega Man, and Duo go ahead to stop Wily and Eggman. They're nearly overpowered until the original Robot Masters arrive to back them up. In addition Tails ends up severely injured after taking a Ballade Cracker to the face while infiltrating the Wily Egg.
Race Against the Clock: The battle against Knuckles Man and Rose Woman as they try to pull a Taking You with Me on the heroes by initiating their self destruct sequences. Meaning they need to be stopped fast.
Real Life Writes the Plot: The reason for the retcon of Sonic's world. One of the writers, Ken Penders, sued Archie Comice over the rights to his characters and managed to win. Thus Ian used the crossover as a convenient way to explain all the changes in Sonic's world at the end of the crossover.
Recoil Boost: One comedic strip has Eggman replace Metal Sonic's chest engine with a Mega Buster for propulsion. It doesn't work.
Red Herring: Mega Man doesn't fire Rouge Woman's Black Wave weapon at all during the crossover. It was supposed to be used to defeat Metal Sonic and Bass after the two fused together to act as a fight to weaken Sonic and Megaman before the fight with the Egg-Wily Machine X, but Sega and Capcom vetoed the whole idea.
Remember the New Guy: Due to Eggman and Wily's Genesis Wave rewriting history, Mega Man's dimension is moved from their current time to a time after Mega Man 10. Because of this, characters like Duonote Who has yet to debut. and Bassnote Who had only made cameos in Short Circuits. are treated as if they had known Mega Man for a while. It also spoils that Proto Mannote Who was working for Wily, under the name Break Man. becomes a good guy and that Ra Moon betrays Wily. Which it does after the crossover ends.
Rock-Paper-Scissors: Shows up twice — once in Mega Man #24 when Eggman and Dr. Wily are arguing over the name of their lair ("Death Egg Mark 3" vs. "Wily Flying Fortress"), and again in Sonic Universe #54 when Sonic and Mega Man determine who to team up against first in their battle against Metal Sonic and Bass.
Screw This, I'm Outta Here: Shadow, who decides to go after vengeance on his own after he gets restored rather than work with Sonic and Mega Man.
Mega Water S. attempts this when the Genesis Unit begins losing to Mega Man and Sonic in Part 5. Proto Man promptly shoots him in the back.
Proto Man's reaction to the doctors trying to goad the heroes into a survival contest. Amusingly enough, this action is probably what saves everyone's lives as he draws more than half the Roboticized Masters after him on a Wild Goose Chase.
It's also shown that Eggman and Wily both know that the heroes will win eventually and have plans to leave the other behind and take with them a Consolation Prize: A massive Death Egg-like machine to terrorize their respective universe.
Second Hour Superpower: The Spin Dash Blast, also known as the 'Sonic Shot', which is instrumental in restoring the Roboticized Masters to normal, isn't given to Mega Man until part 6 of the crossover.
Spikes Of Doom: Referenced in Sonic the Hedgehog #248, when Wily assures Eggman that, as a veteran of dozens of trap-filled fortresses, Mega Man definitely has a problem with spikes... meaning that he's sure the spike covered Sonic will successfully do Mega Man in.
Seen straight up on one panel in Mega Man #27
Spotlight-Stealing Squad/Story Breaker Team Up: Sonic and his friends get the better share of plot events and one-upping the Mega Man side. Most of the plot of the first half is about saving Sonic's friends, and we barely see Mega Man's friends at all, particularly his sister Roll. Sonic also tends to poke fun at Mega Man's heroic attitude, though this is in-character with Sonic's attitude. Eggman is more evil than Wily, a majority of the Robot Masters are only seen for a cannon fodder fight, Duo arrives very late in the story, the MM1 Robot Masters don't appear until the very last issue, Eggman has Metal Sonic nearly kill Dr. Light, who's saved by Shadow the Hedgehog, Bass goes down first in the big fight of part 11, and finally, Eggman makes a final shot as Sonic restores his world, causing it to have major changes after the crossover.
Some of this if justified: Aside from the original Robot Masters, not many of Mega Man's friends are battle capable, also Snively's cameo suggests there's some bits of the comic continuity in here too, including Wily's dismissal of the original Robot Masters as being too weak for his needs. Megaman's the one who restores Sonic's friends. Eggman's tampered with, numerous times, greater forces than what exists in the Mega Man world. Once Duo does arrive, it's made very clear that he's got Story Breaker Power second only to Sonic and Mega Man's super forms. Also, Archie has been dealing with a lawsuit involving former Sonic writer Ken Penders, to the point they've had to remove the characters he's made; Archie is using the crossover to explain the changes to Sonic's world.
Stealth Pun: The Chaos Devil is pretty much both god and devil. Duo even senses a combination of Evil and Nobility inside it. To be specific, it's a mechanical Devil Core plugged into an ancient Water God.
The fight against Metal Sonic and Bass. Metal and Bass. Sonic Universe #54's Off Panel even lampshades this.
Strolling Through the Chaos: Sonic Universe #51 features the Roboticized Master Shadow Man calmly walking through the battlefield, carrying a Chaos Emerald and barking orders while the other three battle Proto Man and Mega Man.
Ten Paces And Turn: Mega Man and Silver Man blast each other at the same time. Mega Man is immobilized by the psychokinetic blast of his opponent, but Silver Man is restored to Silver the Hedgehog by Mega Man's Spin Dash Blast and immediately frees the blue bomber.
Unwilling Roboticisation: Due to not being able to send something from one world to the other without something from the target world, Eggman and Wily combine their technology and subject Tails, Amy, Knuckles, and Shadow to this, creating the "Roboticized Masters." The key to curing them seems to involve Mega Man's weapon copying system, as shown when Mega Man accidentally restores Tails after trying to copy his weapon data.
In Sonic Universe #52, the classic set of eight is complete with the addition of Vector Man, Espio Man, Charmy Man, Blaze Woman, and Silver Man.
In Sonic Universe #53, Rouge the Bat is incapacitated by the Chaos Devil and sent to be roboticized into Rouge Woman.
Villain Ball: If Dr. Eggman had let Proto Man go temporarily rather than sending over half the Roboticized Masters after him, then events might have gone rather differently. Justified in that it was a split-second decision.
Villainous Friendship: Wily and Eggman are Type I. Despite the occasional argument, they get along quite well, and seem to genuinely enjoy the other's company. But not enough to keep from backstabbing the other if things go wrong.
Heck, some of the variant covers display the two as "E.F.F.s" or "Evil Friends Forever"
Villain Team-Up: Eggman and Wily. And unlike most examples of this trope, they get along surprisingly well.
Villainous Breakdown: Both Eggman and Wily both from Sonic and Megaman on the edge of stopping their plan when it's on the verge of completion and the breakdown of their partnership following Eggman's attempt at trying to kill Dr. Light.
Furthermore, Mega Man gets a new weapon in the form of the "Spin Dash Blast", an Energy Ball that uses the unique properties of Sonic's Spin Dash attack.
Wham Episode: For both series once the crossover is done. For Sonic in Sonic the Hedgehog, he suddenly finds himself in an altered Mobius where a lot of things have been re-written. For Blaze in Sonic Universe, not only have a bunch of characters from said altered Mobius been washed ashore onto the Sol Dimension as an aftereffect of the rewriting, but so has the Wily Egg, which her enemies have taken control of. For Mega Man, his world is back in working order but now a new nemesis looms on the horizon, Ra Moon.
What Could Have Been: Ian Flynn was originally planning to have Bass and Metal Sonic combine into a single entity, but this idea was shot down early on.
The weakness of said boss would've been Rouge Woman's Black Wave, the only time it would've been used.
Why Don't Ya Just Shoot Him?: When Dr. Eggman realizes Dr. Light has been aiding Rouge, he decides to just throw him out of the ship. This upsets Wily, who wanted to Dr. Light to see his ultimate triumph.
The fight between Sonic and Megaman at the beginning is supposed to show them as equals in a straight fight. However, Megaman went into that fight after battling the Roboticized Masters at the bank. He also had no special weapons or upgrade parts, so it was a fresh Sonic at full strength against a fatigued Megaman at his base strength.
Blaze's arc before and after the crossover revolved around getting the Sol Emeralds. Once she got them all inTreasure Team Tango she used her Super Mode to shoot down the Egg O'War in panels, something Duo couldn't do after two and half issues of fighting the Chaos Devil. Although, admittedly, Duo was actively trying to beat the curse out of Chaos 0 rather than kill his corrupted form and so may have been pulling his punches a bit. He also wasn't directly targeting the Wily Egg and yet the doctors were still afraid it would become collateral damage.
Wrong Genre Savvy: Many assumptions made by the two doctors regarding Dr. Light's importance and how to deal with it. Wily thinks that with Dr. Light captured, Mega Man's safety net is gone, but he didn't count on Tails being able to fill the gap. Eggman thinks Dr. Light is too clever to let live, but his attempt to kill him doesn't go over well with Wily.
Writing Around Trademarks: The issues preceding and following the crossover employ this when referring to the other series: Eggman calls Wily "Albert" and refers to Bass as "a base villain," Wily calls Eggman "Ivo," Sonic refers to Mega Man as "the kid" and in the Sonic Universe "Pirate Plunder Panic" arc, the Wily Egg, which has fallen into the hands of the Sol Dimension's Metal Sonic, was rechristened by him as the "Egg O'War" (though its Wily skull motif is retained, because said Metal Sonic has remodeled himself into the pirate Captain Metal).
Wronski Feint: Sonic beats Enker by making Punk (in ball form) chase him while he heads towards Enker, dodging at the last second to make Punk crash into Enker. "Follow the bouncing hedgehog", indeed.
Year Inside, Hour Outside: The "Skull Egg Zone" created by Wily and Eggman has this, allowing them to prepare their scheme while very little time passes outside the zone itself.
You Can't Thwart Stage One: Aside from building an entire Pocket Dimension and Ominous Floating Castle unnoticed, Eggman and Wily acquire all seven Chaos Emeralds with so little interference that it mostly happens off-panel. Of course, the two doctors are Genre Savvy enough that they know smooth sailing in the early stages of their plans is no guarantee of victory, especially when their enforcers are getting trashed by the heroes.
Zero-Effort Boss: In the Short Circuits of Part 10, Dr. Eggman and Dr. Wily roboticize Big the Cat into Big Man, and he promptly begins fishing for robotic fish.