Sam started his career as director on the short film The Big Cheese for 3 Peach Animation. He then joined Aardman and worked on projects like Pop, Peter Lord's Oscar-nominated short film Wat's Pig, as well as Rex the Runt, before directing 2002 project Chump. He also developed a kids TV series called Rabbits!
In 2001 he came up with the story of Flushed Away which he developed through 2002. From 2003 he went on to direct the film for Aardman/Dreamworks. He also provided the voices for the characters Liam, the Prophet, Ladykiller and Fanseller.