Black Widow (Age of Apocalypse)

Wasp is the alternate universe counterpart to Natasha Romanova.

Biography
Black Widow was part of the Avengers led by Captain America and consisting of Iron Man, Giant Man, Wasp, Spider-Man, and Hercules. Together they battled the X-Men led by Magneto.

During the battle, two more time travellers, Bishop and Shard, appeared on the battlefield. They took Wolverine and Storm with them as they jumped to another time.

Background
Black Widow's appearance was merely a cameo with no speaking part.

In the Comics
Black Widow doesn't appear in the Age of Apocalypse universe.