Jane begins to see a builder named Roger Smart, a single parent of three children: David, Felicity and Robbie.

Played by Rebecca Hunter, Emily is the eldest of the two Parker children, a fifteen-year-old, football-mad girl trying to survive the madness of the combined family unit.

Together with her brother Joe, they introduce and narrate each episode of the series by occasionally breaking the fourth wall and explaining the mad goings-on.

After their separation, Colin found a new flat nearby, and Emily and Joe visit him for half of the week, and stay at home for the remainder.

After getting depressed with jealousy over Roger, he begins to listen to more modern music and taking more active pastimes with Joe and Emily, including going on roller coasters, attending football matches and rock concerts, hiking, kite-flying, bike-riding and rock-climbing in order to vie for their affections.

teacher Miss Jill Cottingham, before finally dating Jennifer, the family therapist and marries her soon after with their honeymoon in Cornwall.

Played by Ivan Kaye, Roger became the sole head of the Smart family when his wife left to "find herself" in Goa, and began dating Jane after his accident put him in the hospital where she worked.

Not long after meeting the Parkers, he found he had a crush on Emily, but quickly dealt with his feelings after she said that it would never work between them, as they had begun to live as a family unit.

With a vivid imagination, Robbie is often to be found playing around the house, and chatting to his "invisible friend" Pogo, a giant seven-foot blue mouse that follows him everywhere and that nobody except he (and the viewer) can see.

Jennifer is a very caring, understanding woman; these qualities, plus her obsessive-compulsive behavior with cleanliness, drive Emily mad for a time.

His off-and-on relationship with his girlfriend exasperated Emily, who was never able to express her interest before Jim moved to Motherwell for the better job opportunities to be found there.

Both are based on the original scripts by Mark Haddon, with writing by Stephen Cole and illustrations by Philip Thompson and Atholl McDonald.