The fic opens with the birth of a strange vegetarian Piranha Plant who is thrown out of his family after accidentally taking a bite out of his own kind. He is ultimately found by Princess Peach and Toadsworth, who, realizing he isn't dangerous, take it upon themselves to raise and teach him how to read, speak, and interact with society, naming him Billy.
Unfortunately, Bowser and the other Nintendo villains get wind of this, along with a legend about a powerful artifact known as the "Gospil Seed," which is contained in a unique Piranha Plant... and Billy is just that kind of Piranha Plant. Fortunately, the various Nintendo all-stars are there to stop them.
Super Smash Adventures provides examples of the following tropes (Beware of spoilers):
- All There in the Manual: The Original Characters' backgrounds are revealed mostly in character bios on BrawlFan1's Deviantart account.
- Artificial Limbs: Erpain the Python has robotic arms that can be controlled remotely, even if they aren't attached to his body, as Yoshi learns the hard way.
- Avengers, Assemble!: Only a few of the heroes unite during the Peach's Castle siege in Episode 2. They're all brought together by the Elemental Knight's attack on them in Episode 4.
- Bash Brothers: Subverted in the case of both the Koopalings and the Elemental Knights; they constantly end up in each other's way while fighting and are not good at coordinating attacks.
- Big Damn Heroes: Several examples:
- In episode 1, Mario and Luigi show up just in time to stop Bowser from killing Billy.
- In episode 2, DK and Diddy help Mario and Peach fend off a group of Hyrule monsters.
- In episode 3, Yoshi shows up to stop Erpain from eating Pikachu.
- In episdoe 4, Kirby pulls off 2. First, he arrives and frees the heroes, then stops an enraged Hydro Knight from killing Snake, with his presence exposing the villains true colors to the Knights.
- Breaking the Fourth Wall: When Samus is about to cuss out Ridley in episode 4, Sonic promptly cuts her off, reminding her that it's "a PG-rated show."
- Brick Joke: In Part 1 of Episode 7, Ridley complains about not being able to enter Ludwig's lab because the door's too small. Later on in Part 4, he gets fed up with it enough to burn through the wall.
- Butt-Monkey: Luigi, as usual.
- Chirping Crickets: Parodied. Toadsworth stops Falco from breaking down a door because it's expensive, and we hear this. After a second of it, Luigi finds it's coming from a cricket-like enemy behind them, who he promptly kicks away.
- Combat Pragmatist: Both Armados and Snake fight this way.
- Curse Cut Short: In episode 4:Ridley: Aww, is somebody still sore about me murdering her parents?
Samus: Why, you son of a...
Sonic: Whoa! Samus, chill out! This is a PG-rated show!
- Cursed with Awesome: Earthbound Knight is cursed to be forever... well, earthbound, but this renders him immune to being pulled by Link's clawshot.
- Cyborg: Erpain the Python has mechanical arms, as well as a red remote control implanted in his brain that allows him to control them.
- Dynamic Entry: Both King K Rool and King Dedede attempt this in their debut, but their attempts get in the way of each other, almost leading to them trading blows.
- Five-Man Band: While not five people, the group that liberate Peach's Castle in Episode 2 fit the bill:
- Funny Background Event: Kirby is a walking Funny Background Event.
- G-Rated Sex: In episode 3, Maple is delivered to the front gates of Peach's Castle by a stork.
- Give Me a Sword: In episode 4, Typhoon Knight does a variant of this, giving Mario a Wing Cap to even the odds.Typhoon: I believe in a fair fight.
- Gory Discretion Shot: Billy eating several Deku Scrubs in episode 2. All we see is Mario, Peach, DK, and Diddy's shocked faces while the sound of it goes on in the background.
- Heroes Fight Barehanded: Zigzagged in Episode 4; Mario initially tries to fight Typhoon with his hammer, but when Typhoon, citing his belief in a fair fight, gives Mario a Wing Cap to even things out, Mario, after accepting the cap, tosses said hammer aside and takes on Typhoon with his bare fists.
- Hiatus: There tends to be a whole butt load of long time gaps between the uploading of episodes, or even individual parts of an episode. Despite this, BrawlFan1 has made it very clear that he's not letting this show meet the same fate as Super Mario Bros. Z.
- Leeroy Jenkins: Falco rushes in to Peach's Castle to take on the villains who have it under siege... not thinking that they'd be ready for him. Needless to say, he's immediately surrounded and beat up... The same happens to Luigi when he comes to check on things.
- Also, Episode 6, Sonic runs after Popple and Croco without a thought and gets caught in a rope snare for his troubles.
- Let's You and Him Fight: Due to Erpain's natural instincts, he ends up fighting the Pokemon, and later Yoshi, until Boomer stops him.
- Macguffin: The Gospil Seed.
- Mr. Exposition: Professor E Gadd.
- Oh, Crap!: Ridley's reaction to hearing Pikachu ready to shock him is "No! Not again!"
- Snakes Are Evil: Erpain the Python initially appears to an example, but he turns out to be a subversion once Morty Boomer shows up and reveals that Yoshi and the Pokemon are their friends. At that, Erpain promptly backs down and explains that, as a snake, he has to eat something, and he was just following his instincts.
- Spanner in the Works: The villains successfully deceived the Elemental Knights into capturing the heroes with no hope of escape... but nobody counted on Kirby accidentally hitching a ride on Dedede's transport and freeing everyone.
- Squee!: Bowser Jr's reaction to Star Wolf's entrance.
- The Nose Knows: In episode 3, Pikachu realizes that Maple is Mario and Peach's daughter by sniffing her.
- This Is a Drill: Erpain morphs his left hand into a drill while fighting Yoshi in episode 3.