Jonathan Arthur is a stunt actor who is most known on the show for providing the motions for the polar bear in "Further Instructions". He is the husband of Heather Arthur, also a stuntperson on the show. He has also done stunt work on Cloverfield and Indiana Jones and the Kingdom of the Crystal Skull as well as doing stunt work for 25 episodes of Lost in Season 2 and Season 3.

He portrayed a background Tailies in "The Other 48 Days", and also appeared as Simmons in "Happily Ever After".

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