Doctor Who: EVERY NuWho Villain And Monster Ranked Worst To Best

Appear in: Army of Ghosts/Doomsday, Daleks in Manhattan/Evolution of the Daleks.

The only way to tell the difference between these two members of the Cult of Skaro is by their voices: Jast had a higher, more grating pitch.

Despite being tasked to think outside the box, Thay and Jast, along with Dalek Caan, were very much beholden to pure Dalek ideals, which culminated in Thay killing their evolutionary leader Dalek Sec. Not long after, Thay and Jast went down fighting in a blaze of gunfire against the Dalek-Humans, leaving Caan as the only Dalek survivor.