Kephri

Kephri was an Osirian who took on the role of the beetle god in Egyptian mythology. He was trapped by the members of his own race inside a Scarabaeus, which was coincidentally used as a set-piece for a mummy horror movie produced by Monroe Stahr.

However, the sarcophagus was revealed to be empty, because the god had infested and incubated in the living but decaying body of Raschid Karnak. It was only when Peri took off the ankh Karnak was wearing that liberated Kephri from his body. The insectoid god then summoned a swarm of locust which consumed Seth Rakoff and tried to do the same to the entire world.

He was encountered by the Doctor whilst he was on a trip to Hollywood. (DWM: The Curse of the Scarab)