Animaniacs: Wakko's Wish(1999)

Zaniness has no limits.

The Warner Brothers (and the Warner Sister) go on a quest to find a fallen wishing star to help Dot with her illness. Unfortunately the rest of the town, including an evil king, also hear about the star and want to get to it first to have their own wishes come true. It's a race against time and it's up to the three zany siblings to get there first.