Blake's 7 Project Avalon (1978–1981) watch online HD
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The cave scenes were filmed in Wookey Hole, near Wells. This was the same location used for the Doctor Who (1963) serial "Revenge of the Cybermen".
Glynis Barber, who appears as the principal Mutoid in this episode, later returned to the show in the fourth season in the regular role of Soolin.
In the original script, Cally accompanied Blake to the planet. When Sally Knyvette complained that she wasn't given much to do, it was rewritten to have Jenna go down.
Glynis Barber was doubled by Stuart Fell in the scene where her mutoid leaps from a ledge and attacks a guard, who was doubled by Cyd Child. They originally planned to do the opposite stunts, but it didn't look right.
The shoot-out in the base was inspired by the opening battle from Star Wars (1977), which premiered in the UK on the same date that the series aired.
The gun that Chevner uses is actually a US Army M16 automatic weapon.
Before been cast in a guest role in this story Julia Vidler had been seen for Jenna.
This episode also saw the second and last appearance of the Federation Security Robot. The shooting schedules were very tight for the whole of the first season and there just was not enough time to deal with an unruly robot.
Travis states that he could have killed Blake twice if he hadn't been instructed to leave the Liberator intact. This could refer to his on-screen encounters with the Liberator crew in Blake's 7: Seek-Locate-Destroy (1978) and Blake's 7: Duel (1978) but it doesn't seem an accurate description of events so may refer to off-screen encounters. It is notable that at the end of "Duel" Travis was pursuing the Liberator, yet here he is already on the planet waiting for Blake to arrive.
|Episode cast overview, first billed only:|
|Gareth Thomas||-||Roj Blake|
|Sally Knyvette||-||Jenna Stannis|
|Paul Darrow||-||Kerr Avon|
|Michael Keating||-||Vila Restal|
|David Jackson||-||Olag Gan|
|Peter Tuddenham||-||Zen (voice)|
|Stephen Greif||-||Space Commander Travis|
|Jacqueline Pearce||-||Supreme Commander Servalan|