Pantophagen

The Phantophagen were natives to the Time Vortex, similarly as Vortisaurs were.

Biology
Pantophagen are powerful insectoids, capable of ripping through the metal cities of Future humanity, and devoured everything in sight. Despite Jalniks hypothesis that the Pantophagen were sentient and talking to him, the Doctor quickly dismisses such a notion of them being sentient, as he'd be able to communicate with them if they were.

History
Little is known about Pantophagen, before or after Jalnik discovered them during his primitive attempts of traveling through the Time Vortex. Believing they could control them, Jalnik and his conspirators attempted to set loose Pantophagen on earth, but the task of bringing one back turned Jalnik into the first Pantophagen Hybrid, ravaged by hunger and capable of devouring a human in moments.

When several were sucked into 1980's earth, the Doctor used Jalnik's machine to control ghosts, to age them to death. Afterwards, he sealed the crack Jalnik was using to make his way to earth, preventing the Pantophagen from ever coming to Earth in the first place.