The astromech tells the story of how the Y-wing he was serving in during a mission over Ryloth was shot down. He avoided the scrap heap by being rescued, which AP-5 has a hard time believing. Chopper shows him an image of Hera, and AP-5 is impressed.

AP-5 explains that he was reassigned from navigation to inventory after the war. While he took pride in his war responsibilities, he does his new duty as commanded. Though his Imperial supervisors continually disrespect him, he will not disobey his orders. Chopper says there are other options -- like free will.

He admires Chopper's fortitude, but seems resigned to his fate. Suddenly, the captain radios AP-5, screaming at him. "Where's that manifest?!" He tells him to keep an eye out for stow away rebels. AP-5 responds by saying he has seen none. With that, Chopper readies his spark weapon...

...and blasts AP-5's restraining bolt. The inventory droid is free. Chopper has a plan: lure the crew into the cargo hold and jettison it into space.

The captain catches up with them. He demands the manifest and readies a new restraining bolt. Chopper attacks him with his leg, and when the Imperial calls in that he's captured a rebel droid...

...Chopper zaps him.

Stormtroopers in pursuit, Chopper leads them into the cargo hold. He zooms away, heading back toward the ship. The astromech ricochets from wall to wall and comes in for a bumpy landing. AP-5 helps him up and seals the door.

The Ghost arrives back at the rebel fleet and finds it under attack. Ketsu is there to help, but this will not be an easy fight.

Now in the cockpit of the Imperial cargo ship, Chopper and AP-5 argue about who is captain. Chopper plugs into the computer and sets course for the fleet. He calls AP-5 his friend, which gives the inventory droid pause. Finally, Chopper contacts Hera.

With the fleet under attack, Hera says they're going to the Yost system. AP-5 interjects. "The Yost system will not be safe for your friends at all," he says. The Imperial fleet is waiting there. It's a trap. Hera asks how they know, and Chopper reveals that he stole an Imperial freighter. AP-5 readies new, safe coordinates.

But they are not alone. The captain is on the ship, as well. "Your rebel mutiny is over!" he says. AP-5 thanks the captain and says he's been taken prisoner. The diversion works, and Chopper attacks the Imperial.

As AP-5 prepares to transmit coordinates, he's blasted from behind. With his last bit of strength, he sends them through.

Enraged, Chopper charges the Imperial and lands a knockout blow.

As AP-5's power fades, he tells Chopper, "I won't forget you, my friend." The rebels arrive at the planet, which is free from Imperials.

But this is not the end of AP-5. He wakes to find himself fully repaired. Sabine replaced his thermo sensors with those from the leg Chopper stole.

Yes, Chopper sacrificed his replacement leg for his friend. "I knew you had a malfunctioning logic circuit!" AP-5 says.