Fifth Master

The Fifth Master was the fifth (on-screen) incarnation of the renegade Time Lord known as the Master. During the Last Great Time War, he was revived by the Time Lords, who believed that he would be the perfect soldier to fight in the war, due to his savagery. He crossed paths with his old enemy, the Doctor (though the Doctor was unaware that he was the Master) and participated in many engagements in the Time War. He defended a Time Lord-controlled deep space station that was building a super-weapon known as the Cruciform. However, in a surprise attack by the Dalek Emperor's personal fleet, the station was overrun and the Dalek Emperor took control of the Cruciform. Terrified at what the Daleks could do with the Cruciform, the Master abandoned the battle, but not before a Dalek laser hit him fatally and before a Dalek spaceship severely damaged his TARDIS. Resolving to run as far away from the Time War as possible, the Master travelled to the year 100,000,000,000,000 - the end of the universe. Within the ruins of his TARDIS, he regenerated to his sixth incarnation, then used a chameleon arch to turn himself into a human so as to convince the Time Lords that he'd died in the battle.