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The character of the old Mentor was added at a late stage and his scenes written by script editor Eric Saward.
The character of the old Mentor was added at a late stage and his scenes written by script editor Eric Saward.
This episode was watched by 5 million viewers on its original transmission.
The 2019 Season 23 Blu Ray box set extended/alternate version of this episode (on Bonus Disc 1) is 27 minutes 54 seconds.
Guest star Brian Blessed as King Yrcanos is on the rampage to destroy the Mentors. In The Metamorph (1976) Blessed played a character named Mentor.
In The Fifth Doctor story "Planet of Fire", Turlough saves Peri from drowning when she tries to swim to shore. In this story, The 6th Doctor and Peri arrive on Thoros Beta, which is a watery planet.