The plot features Ronald and the gang out on a journey to Grimace Island where Grimace's species is discovered. Grimace previously received a letter which was actually written by the pirate captain One-Eyed Sally and her first mate Blather. The two pirates follow them to capture the treasure on the island.
as Ronald McDonald / Ronald McDonald (voice)
as Sundae (voice)
as Sundae
as Birdie (voice)
as Hamburglar / McNugget #3 (voice)
as Grimace / King Gunga (voice)
as Franklin (voice)
as McNugget #1 (voice)
as McNugget #2 (voice)
as One Eyed Sally (voice)
as Blather (voice)
as Announcer (voice)
