XR, or Xpirimental Ranger (voiced by Larry Miller and Neil Flynn) – A short robot that was originally emotionless and programmed to learn from Buzz, but was blown apart by Agent Z during his first mission. The LGMs rebuilt him, but the temporary loss of the Uni-Mind to Emperor Zurg left them off their game. They rebuilt XR with his slicker, more emotional personality and a variety of attachments. The LGMs have stated that experimental ranger is the official meaning of the name, though other characters on the show hold the erroneous belief that the X stands for Expendable. He gets blown apart on nearly every mission he goes on, but is easily rebuilt. He considers Commander Nebula his father (due to his signing the paperwork authorizing his creation) and is always seeking his approval.