Jetix Oct 2, 2004 X-Men The Animated Series S2 Ep 8 Time Fugitives (Part 2 Of 2)

Cable comes to the present to stop Bishop and save his own future world. He arrives at the same time as Bishop and the two time travelers battle to save their own respective future timelines. Cable finds killing Bishop and helping Apocalypse distasteful, but is prepared to do what it takes to save his son and his future world from ending. Eventually, Cable comes up with the brainwave to deliberately let Wolverine get infected by the virus. Wolverine's healing abilities produce the antibodies needed to create a permanent cure, thwarting Apocalypse. Bishop returns to his timeline and discovers everything is still the same (although there is no longer a plague). Cable returns to his timeline and discovers his world is saved and his son is alive.