David to the Rescue is an episode of David the Gnome. It first aired 18 March 1985, and first aired in the US on 16 May 1987.
David is called to Italy to treat a gnome girl. She had eaten a strawberry that had been sprayed with pesticide. The only plant that can cure her is the Shining Begonia. David travels to the Alps and outsmarts a snake to find the flower. On the way back, he meets Pot, one of the trolls. Pot challenges him to a dancing contest, and David cleverly keeps Pot waiting until the sun comes up. The troll turns into stone in the sunlight. David goes back to the palace and revives the gnome girl.