Robert "Rob" Rackstraw is a British voice actor, who is best known for his roles as Scoop (UK), Muck (UK), Roley (UK), Travis (UK), Spud (UK/US since 2005), and Mr. Bentley (UK/US since 2005) in the British HiT Entertainment children's television series, Bob the Builder (classic version), Campion in Watership Down, Professor Professor in The Secret Show, and James (US since 2015/UK since 2017), Toby (UK since 2015), Etienne (UK/US), Axel (UK/US), Donald (UK/US, both since 2016), Stanley (US 2016), Flynn (UK/US, both since 2015), Raul (UK/US), Monty (US), and many other characters in Thomas & Friends. He is also in the reboot of Teletubbies.

For Disney, he currently voices Kwazii Cat in the Disney Junior British children's television series The Octonauts, and provided additional voices in the Mickey Mouse Clubhouse episode, "Mickey's Monster Musical".

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