It's almost opening day at Yum Yum Fun Park - but something terrible has happened! Those mean and yucky Sourpusses have set out to spoil the big day. Come join the fun as those yummy-smelling Yums Yums meet scary sewer rats, trick a ferocious sewer gator and match wits with the Sourpusses. Will they be able to rescue their magic toolbox and complete repairs in time to make Yum Yum Fun Park... once again... the sweetest and most fantastic amusement park on earth?
Unfortunately the movie The Yum Yums: The Day Things Went Sour is not yet available on Netflix. Follow us on Facebook to see when The Yum Yums: The Day Things Went Sour becomes available on Netflix!
| Writing | Laren Bright | Writer |
| Directing | Ray Patterson | Director |
| Sound | John Debney | Music |
| Production | William Hanna | Executive Producer |
| Production | Joseph Barbera | Executive Producer |
| Production | Jayne Barbera | Executive In Charge Of Production |
| Production | Charles Grosvenor | Producer |
| Art | Bob Onorato | Storyboard Artist |
| Art | Charles Grosvenor | Storyboard Artist |
| Visual Effects | Bob Onorato | Character Designer |
| Visual Effects | Donna Zeller | Character Designer |
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