Unofficial title
No official name has been given to this subject in any licensed Ratchet & Clank media; as such, a descriptive name was chosen.
UFO Robot

Gray Saucer Mechs were enemies in Going Commando, they were huge robot piloted by Gray aliens that were minions of the Mothership. They resembled a typical UFO, except with long legs and ray-guns attached on the sides, and were piloted by aliens resembling stereotypical. They would usually appear in groups, with one chasing Giant Clank, attempting to electrocute him, and any others firing at him with red lasers. These Robots either spawned randomly around the moon, or were deployed in groups of four by the Mothership. Destroying them would also replenish Giant Clank's health.