Born in Devizes, Wiltshire, England, Robertson spent much of his younger life abroad, living in such places as Singapore, Cyprus and the Netherlands, with his family following his RAF fighter pilot father.
He made his return to TV in 2003, playing interplanetary bounty hunter Travis Montana in one season of the Canadian sci-fi series Starhunter.
He also appeared in the soap General Hospital in a recurring role, and worked alongside Julia Roberts, lending his voice to the animated movie The Ant Bully.
He has also acted in several computer games and played the lead role in the 2010 science fiction epic Darkstar: The Interactive Movie,[1] which included a large amount of live-action footage of Robertson.
In September 2007 Robertson married his second wife, the linguist and creator of the 'Early Lingo' educational DVD series Caryn Antonini, in Venice, Italy.