Dalek Thay

Dalek Thay helps Dalek Sec transform into his Hybrid form by sacrificing the back three panels of his casing to act as power conductors. Technically this puts him at a disadvantage, but this doesn't stop him from scouting any area that the Cult of Skaro land in. Which is anywhere because of their ability to Emergancy Temporal Shift.

He was killed by Dalek Humans when they got angry after he accidently shot their leader, Dalek Sec.

Youtube Clip
http://www.youtube.com/watch?v=dMEuefKvUnA&NR=1&feature=endscreen

Dalek Thay's Death, just after Dalek Jast, during a battle with the Dalek Humans.