To cheer up Baby Joe, Miss Moon plants a marshmallow tree producing a magical tree of marshmallows. When the children try the "fruits", they get very funny reactions. But the fun is short-lived: Miss Moons voice has changed and the wand no longer responds to her spells. The only antidote is another candy of the marshmallow tree. But the last one they just plastered...

Luke has to write an essay on prehistoric people for the school. To help him, Miss Moon brings the statue of Honk to life in the Science Museum so Luke can interview him. The conversation turns out to be very one-sided, because Honk does not bring more than "Honk" over his lips and Luke does not seem to understand him. When Honk sees Miss Moon, it happened to him. He instantly falls in love with the nanny and kidnaps him. Luke and Lola try to stay on track.