Blake's 7: Sand

"Sand" is the ninth episode of series four of the British science fiction television series Blake's 7. It was directed by Pennant Roberts with a script written by Terry Nation. It first aired on Monday, November 23rd, 1981 on BBC One. In this episode, Roj Blake is part of a prisoner convoy on the shuttlecraft London en route to a Federation penal colony at Cygnus Alpha. He meet another prisoner named Kerr Avon, and the two formulate a plan to escape.