Rover

S1 E21: ROVER is the junked Sentinel Robot that POLARIS had reassembled from old random parts in the Badlands. And now hes a giant, simple-minded hunk of power, that has become MARROWS best friend. So its not surprising that when XAVIER and BISHOP want to use him on a dangerous mission to retrieve a valuable data core from a Sentinel Facility, Marrow is prepared to run away and leave the team in order to protect her friend.