The Devil's Birthday
S1:E4
2000
IMDb
After God forgets the Devil's birthday, the Devil decides to go back to hell and take all the world's evil to show God how much he really needs him. Up in the world, Bob is realizing how everyone is much too nice, which eventually gets on Bob's nerves. So, he launches on a quest to reunite God and the Devil as friends so the Devil returns the world's evil.