Burn-E - the movie

Burn-E is a short film by Pixar Animation Studios, directed by Wall-E lead animator Angus MacLane, it was produced at the same time as Wall-E, and is included as bonus material to the DVD and Blu-ray release.

If Burn-E (a repair unit) had known how much trouble he'll be in because of Wall-E (the last cleaning robot from Earth), who is pursuing EVE (a robot sent to investigate if the situation on Earth has changed since the human kind left it), then he'd taken the day off.

source: wikipedia