K9 by Lucy Crewe
K-9 Mark I by Lucy Crewe

Part 3 of The Invasion of Time aired this day in 1978. The story featured Leela (Louise Jameson) in her final appearance along with K-9 “Mark I”, when she decides to stay on Gallifrey.

Bob Baker and Dave Martin created the robot companion in The Invisible Enemy (1977); it was designed by Tony Harding, made by the BBC VFX Department as a radio-operated prop as opposed to using a small actor inside a costume. It didn’t entirely work during production however, due to interference or uneven terrain, so the crew would revert to pulling it with twine or rolling it on wooden planks.


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