Skaldak

Skaldak is an Ice Warrior who first appears at the beginning of Season 2. He helps the Doctor and his allies up until his death at the end of Season 10.

Personality
Skaldak is very respected on his home planet of Mars. He is loyal to his people and the Doctors. He also cares a great deal for them. There are times where he gets aggravated, like when a Giant Eagle abducted him because she thought he was her missing chick.

Abilities
Skaldak has a very high amount of strength, being an Ice Warrior, easily able to lift a Dalek over his head. He can also extend wires from his fingers to operate mechanisms and input codes. His main weapon is a sonic blaster on his right wrist.

Death
In the Season 10 finale, during the Heroes' battle against the large Dalek army on Spiridon, Skaldak sees that his friends cannot survive the onslaught of Daleks. As a result, he orders the Doctors and their friends out while he seals the doors, trapping him in with the Daleks. He is shot several times by the Daleks, but in his dying actions, he manages to wreck the heating control, reducing the temperature and causing the Daleks to deactivate. When the Doctors and their friends return to Mars, they get the Ice Warriors to erect a statue in Skaldak's honor.

In Season 11, Azaxyr asks the Doctor and company what happened to Skaldak, and the Ninth Doctor tells him that he sacrificed himself to stop the Daleks from escaping Spiridon. Azaxyr replies with disappointment, stating that he had a great deal of respect for him.

In Season 13, the Doctors manage to get Azaxyr to turn against the Cyber Controller by reminding him of Skaldak's legacy.