Robson voiced Bloom in the cartoon Pippi Longstocking and Matthew Cuthbert in Anne of Green Gables: The Animated Series. He also voiced Professor Cuthbert Calculus on The Adventures of Tintin (TV series) between 1991-1992, and voiced Melvin Fish in the animated series Bob and Margaret. Robson played minor characters in such films as Finders Keepers (1984), One Magic Christmas (1985), Parents (1989), Frank on The Rescuers Down Under (1990), Double, Double, Toil and Trouble (1993), Dolores Claiborne (1995), Two If by Sea (1996), Cube (1997), Wrong Turn (2003), Welcome to Mooseport (2004), The Incredible Hulk (2008) and Survival of the Dead (2009).