Julian Dana William McMahon (born 27 July 1968) is an Australian–American actor. He is the only son of Sir William McMahon, a former Prime Minister of Australia. He is best known for his roles as Ben Lucini in Home and Away, Detective John Grant in Profiler, Cole Turner in Charmed, Christian Troy in Nip/Tuck, Doctor Doom in the Fantastic Four duology, Jonah in Runaways, and Jess LaCroix in CBS crime drama FBI: Most Wanted. For his performance in Nip/Tuck, McMahon was nominated for the Golden Globe for Best Actor in a Television Drama Series.

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