Throughout its history of publications, Marvel Comics has produced many inter-company crossover stories combining characters from different series. The following is a list of crossover events involving superheroes and characters from other series.
Secret Wars was the first modern Marvel event where a separate limited series was launched, with other tie-ins following it. After its release, Marvel started having annual crossover events where a miniseries was established for the event, which impacted most Marvel comic books.
The Infinity Trilogy is a three-event arc about the Infinity Gems. Part 2 (Infinity War) and Part 3 (Infinity Crusade) deal with the fallout of the Infinity Gauntlet: the creation of separate parts of cosmic hero Adam Warlock, Goddess, and Magus.
As X-Men popularity grew in the 1980s, Marvel started doing crossovers between X-Men books, usually dubbed X-Overs.