Lieutenant Commander Yoomoh is a sentient hologram who is the chief engineer on the USS Chichen Itza. He was created as a joke, with the head of a raccoon, the feet of a horse and the tail of a dolphin. Part of the gag was that he cannot be deactivated. Being on constantly allowed him to become sentient. He recieved his mobile emitter for his second birthday. A year later he was admitted to Starfleet Academy. In 2377 he saved the Chichen Itza from tribbles and was rewarded with the rank of Lieutenant Commander and replaced the late chief engineer.