List of fictional crossovers

This article comprises a list of fictional crossovers that have occurred between different fictional characters/properties over different media. It does not include unofficial or fanmade crossovers.

Most of these crossovers can be assumed to be in continuity for one or both of the characters or universes involved, although the events of the crossover may not be mentioned afterward by either party. See fictional universe for more closely linked crossovers. Many spinoffs cross over with their parent series or originated as a one-time crossover. This section also does not list brief minor appearances, which are covered in the "gag cameo" section.

These are crossovers that exist outside of their own setting, as an alternate universe or a "what if" scenario. Non-continuity crossovers may still borrow or resolve plots from their respective series, but have no evidence to support their occurrence officially in either setting.

A character appears only briefly in another setting, mainly for joke purposes.

Appearances and/or references of plots, items, materials, and/or objects that appear in another setting. Often used as a non-sequitur or anachronistic gag.

...
Wikipedia