Harker was the bosun on Lord Palmerdale's luxury steam yacht. He was one of only four people to survive the yacht's crash on Fang Rock. He found Ben's body in the sea while tying up the boat.

He was later killed in the lighthouse's boiler room when he was attacked by the Rutan posing as one of the lighthouse keepers, Reuben. (TV: Horror of Fang Rock)

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