Heff

 was the son of Virna. He wanted to go back and leave the ship. He thought he was the brains of the family. He wanted to ask the Fifth Doctor and Nyssa for help. He worked out that you had to set off the trap to open the doors. Virna left him to get eaten by the Arrit-Ko. Hannah Bartholemew promised to vow revenge for her death. (AUDIO: Tomb Ship)