Donald Duck: Merman Donald

Donald Duck: Merman Donald is a 2010 Disney TV show.

Plot
In this show, DD swallow a bottle of "aqua-pills", givinghim gills on his neck, which enables him to breathe under water like a fish — and he doesn't know when the pills will wear off! He settles for a life at the bottom of the ocean, and soon learns that there's more than one kind of shark to look out for.