|First appearance||"The Farnsworth Parabox" (4ACV15)|
Universe 1 is an alternate universe whose key difference with Universe Γ in this Universe is that coin flips have opposite outcomes. The Parallel Universe Boxes here are blue, and instead of the sky being blue with clouds, and at night sky being black, the sky is like a rainbow. At night the colors are darker.
Leela A: This is getting confusing. Why don't we call our universe "Universe A" and this universe "Universe B"?
Bender 1: Hey! Why can't we be Universe A?
Fry 1: Yeah!
Amy 1: Yeah!
Farnsworth 1: We want A!
Zoidberg 1: It's the best letter!
Fry A: We called it first. Besides, this place kinda feels like a "B", y'know?
Leela 1: Alright, you can be crummy Universe A and we'll be Universe 1.
Fry 1: Or "The Mongooses". That's a cool team name. The Fighting Mongooses!
Farnsworth A: Wait a second. If everyone is identical, why did our Leela look into the box and your Leela didn't?
Leela 1: Well, to be honest, I tossed a coin. It came up tails so I didn't look.
Leela A: That's weird. Mine came up heads, so I did.
Farnsworth A: Interesting. Apparently, the key difference between our universes is that coin flips have opposite outcomes.