->''"Jazz had gone insane. The scene had repeated countless times. It felt like a nightmare she couldn't wake up from. She was curled in a fetal position, mumbling 'it's only a nightmare', over and over and over.''
-->--Jazz Fenton, reacting as any sane person would to the When Worlds Collide universe.

''When Worlds Collide'' is an OldShame MassiveMultiplayerCrossover series of fics written by Tropers/{{Ronnie}}. It is, quite possibly, the most schizophrenic thing ever written, and would concern any psychiatrist. It consists of four fanfictions.

* ''[[WesternAnimation/DannyPhantom Danny]] and [[WesternAnimation/DarkwingDuck Darkwing]] in [[http://www.fanfiction.net/s/3077365/1/Danny_Phantom_and_Darkwing_in_When_Worlds_Collide When Worlds Collide]]'', in which through a contrived and overall odd chain of events, including 2 major character deaths, Danny Phantom and Darkwing Duck must scour the multiiverse for the five pieces of a gateway to immortality. Including poorly done WholePlotReference universes!
* ''[[http://www.fanfiction.net/s/3133627/1/Danny_and_Darkwing_in_Dan_Phantoms_Return When Worlds Collide 2: Dan Phantom's Return]]'', in which the universe continues with MirrorUniverse Clockwork and Danny free our universe's Dan Phantom and begin amassing an army of [[EvilTwin Evil Dannys]] from {{Alternate Universe}}s, and pulling and brainwashing the good ones, to take over the Multiverse ([[ShoutOut "OF COURSE!"]]) They go through the multiverses trying to find the bandit, run into the [[AuthorAvatar author]], subsequently rage at him for the horrible things he's "done" to them, and inadvertently lead to Dan Phantom getting the most powerful weapon: the keyboard. Samantha's consciousness ends up kicked out of her body so it'll obey completely, she then finds herself able to navigate the multiversal planes freely, and, with the help of Professor X and the ComicBook/{{X-Men}}, defeats Dan.
* ''[[http://www.fanfiction.net/s/3192828/1/Mystery_Danny_Theater_3000 Mystery Danny Theater 3000]]'', a fic with said author, Danny, Sam and [[{{MST3K}} the 'bots]] [=MSTing=] actual DP episodes.
* ''[[http://www.fanfiction.net/s/3221704/1/When_Worlds_Collide_3_Double_or_Nothing When Worlds Collide 3: Double or Nothing]]'', in which Vlad essentially recreates Dan Phantom when he has the idea to bridge the gaps in Danny's morph DNA with his own, creating a horrible future Danny, the author, and the Bots explore. Includes a ''Franchise/StarTrek'' parody verse, a drop-in by Film/{{Beetlejuice}}, and [[Franchise/StarTrek Q]] and Clockwork teaming up to make Vlad pull a HeelFaceTurn.
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!!This series provides examples of:
* AnyoneCanDie: Sam Manson and Gosalyn Mallard. ''[[RefugeInAudacity In chapter one alone.]]''
* AuthorAvatar: Ron
* BrainwashedAndCrazy: Sam and an army of Dannys in the second.
* ChekhovsGun: The ''Disney/{{Aladdin}}'' parody universe as a whole.
* ContinuityNod: Various, notably Vlad's cloning scheme coming to fruition, Tucker's Ghost Half from ''What You Want'' making a second appearance.
* FanDumb: The aforementioned Author Avatar makes it VERY clear what side of it he's on, one of the reasons it ''is'' an OldShame.
* FightingFromTheInside: Sam, in the second one.
* IronicHell: Somewhat- Dan Phantom places each character in a situation he'd call their personal hell, based on their own fears and inner demons- Danielle gets told she was never loved, Tucker faces off with his worst aspects as seen in his Ghost Half, Jazz is confronted with an eternity of Danny berating her, and Danny has to watch it all unfolding.
* LampshadeHanging:
* MirrorUniverse: A key part of the plot of the second.
* MST3KMantra: Invoked in the MST3K entry, when Vlad is back from the dead for no good reason.
* NoFourthWall: By the third fic, the important characters know it's a story. They just don't know whose, as the author is with them. Additionally, in the MST3K fic, Danny is forced to watch episodes ''of his own show''.
* RewritingReality: Dan does this after the fourth wall is shattered using a real-world keyboard.
* TwistEnding: [[spoiler: Danielle showing up to save everyone in the end of the first.]]
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