The unlikely team of Wedge, AP-5, and Chopper head out for an undercover mission to recover Imperial codes for the attack on Lothal.

Quickly, however, an Imperial listener ship identifies AP-5 and Chopper. Controller LT-319 sets a trap to reprogram Chopper and succeeds -- though AP-5 manages to steal the codes.

AP-5 notices that Chopper's behavior has become rather strange -- the astromech is being somewhat polite and using Imperial terms -- and tries to warn Wedge. The pilot thinks the inventory droid is paranoid, and dismisses his claims.

Meanwhile, Controller LT-319 commands Chopper's actions with hopes to uncover the location of the rebel base.

Back on the Ghost, Chopper opens the cargo bay doors. The vacuum is extremely powerful, but Hera reaches the override and closes the airlock. Accessing the ship's data, Hera learns that Chopper has indeed been compromised and the Empire is hunting for the rebel base location.

AP-5 goes outside the ship to operate an access port that can unlock the engine room hatch. Chopper greets him with a flurry of blasts, but AP-5 deflects them and successfully opens the grate.

Chopper, having tackled AP-5 away from the ship, goes back to the cockpit to finish the job. Zeb is waiting with his bo-rifle and zaps the droid before he can complete the data transfer.

Hera has a plan. Reverse the feed and send back a bit more power to the Imperials. The circuits on the Imperial ship overload, and it explodes.

The real Chopper is back. But where is AP-5? Still outside, and he has a peaceful moment of song with some strange creatures -- before the Ghost interrupts and rescues him.

His apology not quite accepted, Chopper hits AP-5 and Wedge. "Don't mess with my droid," Hera says.