Disney's Ariel the Little Mermaid

Help either Ariel, the gleeful little mermaid, or Triton, her father, foil the evil Ursula, who has transformed everyone into small, green worm-like creatures, including the character you don't initially choose. Rescuing requires you to simply swim into the unfortunate little victims as they hang about at fixed places in the watery world; while fending off and dodging enemies like eels, clams, sharks, and several other sea meanies. Friends like Flounder and Sebastian can also be summoned for a little helping hand.