Out of the Unknown

Season 1, Episode 7: Sucker Bait

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An expedition sets out to discover what has happened to a lost colony on a distant planet. Amongst the scientists is a strange, intense teenager called Mark Annuncio, raised to be a kind of human computer, able to make connections between different specialisms. Disliked by the crew, Mark nevertheless may be the only person capable of saving the ship when they land and scientists begin dying mysteriously.