Lighthouse in Space (unproduced TV story)

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Lighthouse in Space was a story of Doctor Who: The Animated Series featuring the Eighth Doctor. (VV 5)

Plot Summary
The Doctor and Liz arrive on an asteroid which bears a large manned lighthouse where mysterious deaths have occurred and the only survivor, a man driven insane by what he witnessed, can only cope by believing the Doctor killed the other crewmen and by imprisoning the Doctor [who is] forthright and responsible. Meanwhile the actual killer, a dreaded powerful [creature] called the Primate is wandering around the lighthouse unchecked and Liz is its next prey. (VV 5)