Buzz Lightyear of Star Command (2000)

Season 1: Episode 18

One of Zurg's Brain Pods (Number 13) goes AWOL, so Zurg hires the Boba Fett-esque bounty hunter Shiv Katall to track him down; Buzz turns out to've been Shiv all this time, in order to make defectors from Planet Z seem to be dead, when they're really in a witness relocation program; Buzz gets found out, so Commander Nebula has to do the Shiv-thing (...which he USED to do, before Buzz came along...), in order to make Zurg regain trust in the existence of Shiv Katall.