Sir Billi is a 2012 Scottish computer animated adventure comedy feature film. Directed by Sascha Hartmann, the film stars the voices of Christopher Alexander, John Amabile, Sean Connery, Alan Cumming, Patrick Doyle and Kieron Elliott. The film premiered on April 13, 2012, at the Sonoma International Film Festival. Sir Billi is an adventure about the race to save the last beaver in Scotland, led by Sir Billi; veterinarian by profession, skateboarder by passion and grandfather by love. An old, skateboarding veterinarian Sir Billi goes above and beyond the call of responsibility fighting villainous policemen and strong lairds in a war to save an illegal fugitive - Bessie Boo the beaver. An heart warming and action packed family movie where thrilling car chases, heroic skydiving and daring stunts from this octogenarian, fueled with encounters with a hostile submarine, will keep you at the edge of your seat. Everybody desires a grand father like Sir Billi, the Guardian of the Highlands. Sascha Hartmann directed Sir Billi from a screenplay written by his wife Tessa, based on an original story they developed together.

Sir Billi the Vet is a 2006 computer animated short adventure film written by Tessa Hartmann.