The robot's exterior shell was colored red. It was constructed with a circular head, torso, two clawed arms and tractor wheels at the base. It had unspecified telepathic abilities.
In 2266, Spock was captured by a terrorist on Fayo who gave Kirk three minutes to trade Spock's life for that of Prince Yano, son of Emperor Bavoda. Kirk had vowed never to negotiate with terrorists, prompting the chance that Spock would be killed. Memories flooded through his mind of Spock, including incidents with the Brain Ray Robot, Duanda and Asteroid Delta. (TOS comic: "Prince Traitor")