: References to "City on the Edge of Forever" and "Little Green Men".
: Note that this is the 51st episode produced (a nod to Area 51) and won the 2002 Emmy for Outstanding Animated Program . II. Plot Summary & Context
: Discuss how this "incestuous" solution creates Fry’s unique lack of a delta brain wave, a plot point that later makes him the "most important person in the universe". IV. Cultural Satire & Allusions
: Explain the "rare" cause of time travel—a supernova's red radiation reacting with blue radiation from a microwave—which ensures the crew can't simply travel back whenever they want.
The Subversion of Time Travel Tropes in Futurama