The cartoon was created so people can be more aware of a mental condition called Dyspraxia that affects a child's coordination and so the younger viewers can get off the sofa and copy the exercises of Tom.
Live-action Tom is played by Sophie Aldred's son, Adam Henderson.
Sophie Aldred (voice of Tom) played Ace, the companion of the 7th Doctor (Sylvester McCoy) in "Doctor Who" and David Tennant (voice of Twiggs) played the 10th Doctor in the revived series of "Doctor Who."
Although the title character Tom is a boy, the voice of the character is actually provided by a woman - Sophie Aldred.
Mark Bonnar replaced David Tennant as Twigs' voice later in the series.