Episode 53 - The Ambassadors of Death

A manned space reconnaissance probe is on its way back to Earth
after having been out of contact for several months. Just what
happened to the crew of the shuttle and what is the secret behind
the coded messages they are sending back to Space Control. This
week Paddy and Tricia follow The Doctor and his allies in a race
against the clock as they face off against a sinister conspiracy
that is stopping them from uncovering the mystery of The
Ambassadors of Death.