Red robot
From Tardis Wiki, the free Doctor Who reference
A Red Robot was sent to Earth to find the heir to the throne of an unnamed planet. Along with a Yellow Robot, it removed all the humans from Earth while they searched. The heir, a half-human called Gavin, was hidden by a biodamper. When the biodamper was removed, the robots recognised him. At his order, they returned the humans and took Gavin home. (TV: The Empty Planet)
