Christensen's career started with a crisp. In 1988, aged seven, he accompanied his older sister, Hejsa, then Junior World Trampoline Champion, to an audition for a Pringles commercial where trampoline theatrics were required. There, he was spotted by an agent, and within months he'd been cast in a series of cough medicine ads. Aged 12, he appeared in Canada's first daytime soap, Family Passions, and graduated on to various low-key TV and film roles while a student in a Toronto 'performing arts' high school.