Many long-gone and/or forgotten Humongous Mecha shows, for example, often get a new lease on life, or even a brand-new sequel or remake, after making an appearance or two in a Super Robot Wars game. These games, depending on how far or how deep they mine, can have interesting effects on the fiction chosen.

This trope has become increasingly common in video games, especially those involving both licensed and original properties. Thus, this is much more common in animated works - although you can generally expect The BBC to pull one out of somewhere when Children in Need or Comic Relief rolls around. This rarely occurs in live action shows, unless a production company can be formed that holds copyrights to everything, or where Public Domain Characters and/or Product Placement from different companies are involved. As Story Arcs have become more prevalent, this practice has somewhat lessened, with shifts to strict Verse building and explicit references. It also becomes more viable the farther you get from canon, such as one-time TV specials and especially video games. Sometimes characters are anthropomorphise in various ways so that they can interact better.

To lessen canon-faulting, especially with series that do have strict continuity, a new 'neutral' setting is made that offers equal footing for all the characters. More often than not, this is a mash up of series which do not have a strict sense of continuity or a clear Universe Bible. Jenny Wakeman, Nicktoons: Attack of the ToybotsĪ crossover that involves characters from more than two works of fiction.

Casino Kid and The Lion King Crossover