The Master (Common Series)

The Master is a renegade Time Lord and the Doctor's archenemy. This is his seventh on screen incarnation.

Survival and Regeneration
It is revealed in The Borderland that he stole a Time Ring from the Doctor's TARDIS(some time between the events of Utopia and The Sound of Drums) and used it to teleport offworld moments before the link was completely closed. He ended up on Procyon 5 in the year 3223 during the middle of a crissis with his life force almost gone. However in a last moment of self preservation he channeled all of his willpower and managed to regenerate once again, changing into a younger incarnation in his late 20s curing him of his constant hunger. The first thing this new incarnation did was to yell in joy and bliss as he was free of the drumming and the Time Lords, free to be the master of the universe.

Taking over Procyon 5
After that he set of to be the new leader of the Procyon 5 collony. At that time the Human Empire was fractured following the 29th century solar flare crissis and the collonies were suffering a massive shortage of vital supplies. The Master used his hypnotic abilities in order to gain controll of the collony officials and ordered the construction of a fleet of spaceships. With it he can take over the rest of the Empire and use it as a starting point to eslave the rest of reality.