In this episode the crew goes to see a supernova explosion.Then during the explosion Fry puts something thats not microwavable into a microwave and when the two waves collide they all get set back in time to the 40s.During that time they have to try and fit in with everybody else.Also during that time they try very hard not to change the past in any way but unfortantly they do change the past a little.The only reason they can't get back to their own time is because they need another microwave oven but sence there are none in the 1940s so thats why they must change history if they ever want to get back to their own time.
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