Mr. Squiggle is a marionette with a pencil for a nose, who visits his friends from his home at 93 Crater Crescent on the Moon, flying in his pet rocket (named Rocket). In every episode he would create several pictures from “squiggles“ sent in by children from around the country. Mr Squiggle is a cheery, scatter-brained character who is often distracted and occasionally goes for “space-walks“, leading his assistant to calm him down and get him to focus on the task of drawing. Mr. Squiggle was helped by a human assistant in all of the show's incarnations; they included Miss Gina (Gina Curtis), Miss Pat (Pat Lovell), Miss Jane (Jane Fennell), and later series featured Roxanne (Roxanne Kimmorley) and Rebecca (Rebecca Hetherington, Hetherington's daughter). Other puppet characters that appeared in the show included: Blackboard, the grumpy blackboard that Mr. Squiggle uses for an easel, whose catchphrases are “Hurrry up“, “Hmmph“, “Double hmmph“ and “Booorrriing“.