Cerberus (myth)

Cerberus was a mythological guardian of the underworld, a dog with three heads. The heads barked of the past, present and future. It was an Other-worlder.

The constellation Eta Lupi (also known as Cerberus) was named after the character, as well as the Federation Cerberus colony.

History
In 2366, Deanna Troi had a waking dream in which the shape-changer Proteus and a band of Other-worlders assaulted CephCom, the headquarters of Cephalic Security in the city of  on the planet Rampart. Proteus shape-changed into Cerberus, frightening the security officers. (}