Crossover Event

In shared universes such as Marvel's and DC's, a crossover event is a large storyline in which many heroes meet a single threat. The core story runs in a dedicated limited series; regular titles publish tie-in issues showing what their characters do during the event.

Landmarks

Marvel's Secret Wars (1984–1985) and DC's Crisis on Infinite Earths (1985–1986) set the template. Crisis also reorganised DC's continuity, merging decades of parallel worlds into one — the first of many events used to reset a universe.

Reading one

The core series usually reads on its own. Tie-ins add detail but are optional; collected editions often gather the event itself in one book and the tie-ins in companions.

Event fatigue

Because events are frequent in superhero publishing, readers sometimes find their regular series interrupted by tie-ins. Collected editions handle this in different ways: some include the tie-in issues in the series' own volume, others leave them in the event's companion books. Checking the issue list before buying avoids surprises.

Events as entry points

A major event can be a good way into a shared universe, because it introduces many characters at once. The best events are written to be read on their own, with the core story complete in its collected edition.

Start with the core event collection. If a tie-in follows a character you love, add that one; you do not need them all.