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.
Unfortunately the movie The Wacky Adventures of Ronald McDonald: The Legend of Grimace Island is not yet available on HBO Max.
| Directing | Jim Duffy | Director |
| Writing | Mark Zaslove | Writer |
| Writing | Eryk Casemiro | Writer |
| Writing | Jane Reardon | Writer |
| Writing | Vanessa Kaufman | Writer |
| Sound | Mark Mothersbaugh | Music |
| Sound | Robert Mothersbaugh | Music |
| Sound | Bob Casale | Music Producer |
| Production | Arlene Klasky | Executive Producer |
| Production | Gábor Csupó | Executive Producer |
| Production | Allan Brown | Executive Co-Producer |
| Production | Eryk Casemiro | Supervising Producer |
| Production | Celia Nichols Duffy | Supervising Producer |
| Writing | Jim Duffy | Creative Producer |
| Production | Jane Reardon | Producer |
| Crew | Michael Moroneso | Post Production Assistant |
| Editing | Peter Tomaszewicz | Editor |
| Crew | Miguel Villegas | Post Production Assistant |
| Sound | Peter S. Carlstedt | Recording Supervision |
| Sound | Krandal Crews | Sound |
| Sound | Scott Mathers | Recording Supervision |
| Art | Lisa Atlas | Art Department Coordinator |