My Parents Are Aliens (1999) : 7x16

Brian buys a racing pigeon for Harry. The pigeon is called Humphrey and Harry likes him for the outset. When Humphrey goes missing, Brian is blamed, so he tries to make things better by morphing into Humphrey himself. Meanwhile, Sophie morphs into Josh and sets up a stall selling stolen medical supplies. This gets Josh into a massive amount of trouble but Sophie saves the day by making Mr. Whiteside let Josh out of the punishment. When this problem is sorted there is one more problem to be solved, Harry entered Brain as a pigeon into a race where he has to make it home again from the starting line and he hasn't found his way home for days. Three days after Brian was sent into the race he returns to find that everyone loves him and is glad to see him.