Rassilon

Rassilon developed the Galifreyan time travel technology with fellow legend Omega. While Omega got stuck in a black hole and went totes malotes loony tunes, Rassilon created the Eye of Harmony and used it to not only create the Time Lords as we know them, but to take over as their despotic ruler.
Podcast C130 The Five Doctors > > > > > > > > > > > > > > > > > > > > > > >

Four-and-a-bit Doctors battle Cybers, a chap in silver spandex and a Time Lord conspiracy in the 20th Anniversary Special
Podcast N129 Hell Bent > > > > > >

An undead companion gets a shot at a spinoff and all life in the universe may or may not pay the price for it
Podcast N060 The End of Time, Part 2 > > > > > > > > > > > > > > > > > > > > >

Far too many farewells pepper The Tenth Doctor’s long-awaited yet sadly poor departure.