What's an Abra Without a Cadabra? (1989)

Justin and his sister Kim are magically transported to Figonia by reciting the magic words in a mysterious magic kit. Once there, Figment hesitantly informs them that he doesn't know the magical words to return them home, so they enlist the help of Merlin to figure out a solution. Comparing and contrasting the sound, spelling, and meaning of words is the key to getting them back home again.