Robert "Rob" Rackstraw is a British voice actor who is best known for his roles as Scoop (UK), Muck (UK), Roley (UK), Travis (UK) and Spud (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.

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