Jetix Sept 25, 2004 X-Men The Animated Series S2 Ep 7 Time Fugitives Part 1

In the future, Cable realizes his world is disappearing due to Bishop's time travelling interference. Bishop had time traveled from 2055 AD to stop a plague that Apocalypse started. The plague was scientifically engineered and used by terrorist groups to increase anti-mutant sentiment (falsely accusing mutants of spreading the plague). The X-Men succeed in destroying Apocalypse's laboratory but are killed by Apocalypse in the process. Cable (from the future) realizes with horror that he will have to team up with Apocalypse in order to save his timeline.