Hilliard was a four-legged lifeform resembling a large green dog. He was the bodyguard of the Curator of the Museum of Missing Ships. Despite his appearance, he was basically harmless.
History[]
Hilliard accompanied the Curator when he welcomed USS Enterprise officers James T. Kirk, Spock and Leonard McCoy to the Museum. When a group of Klingons seized the Museum and captured its inhabitants, he tried to attack them, but was shot by a sonic disruptor. He survived this and later freed the Starfleet officers from their bonds. Hilliard died along with the other inhabitants of the Museum when Limbo exploded. (TOS comic: "Museum at the End of Time")