Wolverine and the X-Men Season 1 Episode 21

Rover is the junked Sentinel Robot that Polaris had reassembled from old random parts in the Badlands. And now he's a giant, simple-minded hunk of power that has become Marrow's best friend. So it's not surprising when Marrow is prepared to run away and leave the team in order to protect Rover from the Xavier and Bishop's dangerous mission to retrieve a valuable data core from a Sentinel Facility.