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Spencer was born in Melbourne, Australia. His parents Robyn and Rodney Spencer are the founders of the Australians Against Further Immigration political party and have run several times as candidates in federal and state elections for that party and for One Nation. He is one of four children with two older brothers, Tarney, who is an oculo-plastic surgeon, Luke, who is an orthopaedic registrar, and a younger sister, Polly, who is an anaesthetic registrar.
Spencer attended Canterbury Primary School, Malvern Central School and the private Scotch College. Whilst at Scotch he auditioned for the long-running soap opera, Neighbours. He continued to work toward his VCE qualification while working on the show and graduated in 1997.
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