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A young Rimmer is told by his mother that he is in danger of being held back a year in school and it could change his life forever.
30 years later, Arnold 'Ace' Rimmer, Test Pilot for the Space Corps Special Service, lands his jet safely and greets his friends; Spanners, an engineer resembling Lister; Padre, a priest who looks like Cat; Bongo, Kryten without his mechanoid suit; and Mellie, bearing a striking likeness to a full-bodied Holly.
Bongo informs Ace of a special space craft that can cross dimensions which Ace immediately volunteers to test fly, even though he cannot come back to his reality.
Aboard Red Dwarf Lister, Kryten and Cat try to sneak off to go fishing but accidentally wake up Rimmer and are forced to bring him. They head off in Starbug where they crash into Ace's spaceship and crash land on the ocean planet. Ace heads down to Starbug and offers his assistance to repair the engine and Rimmer takes an instant dislike to him. Ace and Lister repair the engine and they return to Red Dwarf where Ace again shows off his superiority by operating on Cat's broken leg and then fixing his own broken arm. Rimmer continues to wail on about how much he hates Ace until Ace decides to leave saying that he too cannot stand this other side of himself. He tells Lister of the decision that was made in their childhood and reveals which one of them was left behind in school (can you guess? 'cos i'm not telling!)
Ace leaves aboard his ship while Rimmer plays his Hammond Organ Owners Society CD's to the skutters.