Bowerman had previously appeared in the Doctor Who story Survival (1989).
He will be appearing in the Doctor Who 50th Anniversary special as The General.
He appeared in the Doctor Who story The Time Monster.
Ryan also appeared in the Doctor Who episode "Midnight".
The Supremo also appeared in the 1966 Doctor Who Annual.
He also appeared in the Doctor Who audio play, Shadow of the Past.
He also appeared in the Doctor Who serial The Creature from the Pit.
He appeared in the Doctor Who story The End of Time.
Appearing in the control centre, the Doctor and Martha notice that the creatures prepare to kill the population of Earth below.
It appeared in the 2006 Doctor Who episode titled "Love & Monsters".