sequel and the third film and the bridge between High Schoolers 2 and its sequel. It is a crossover between Sausage Party, Annoying Orange, South Park, and High Schoolers.An Insane High School Surprise is an upcoming 2032 American direct-to-video adult computer-animated musical comedy-drama adventure film. It serves as a bridge between the
D.J. and his friends from High Schoolers sneak into the Sausage Party world and suddenly find the pottymouthed kids of South Park.
- Jason Bateman as Toilet Paper, one of the two main protagonists.
- Seth Rogen as Frank
- Kristen Wiig as Brenda
- Danny McBride as Choco
- Edward Norton as Sammy Bagel Jr
- Ryan Reynolds as Russell, an lettuce who is one of Collin's lettuce buds
- Bill Hader as Green, an lettuce who is one of Collin's lettuce buds
- Josh Keaton as Leaf, an lettuce who is one of Collin's lettuce buds
- Michael Cera as Barry
- Jonah Hill as Splash
- Lauren Miller as Camille Toh
- Josh Gad as Gummy
- Scott Underwood as Gum
- Selena Gomez as Haley Flanagan, one of the two main protagonists.
- Freddie Prinze Jr. as Collin Brady (revived as a lettuce)
- Anne Hathaway as Lagan Fuller
- Seth Rogen as David Jones 'D.J' Myrick
- Kristen Wiig as Ashleigh Jefferys; Haley Grace Malone
- Kate Winslet as Morgan Bendall; Heather Adams
- Nicole Oliver as Elisha Preston; Jasmine Todd (Ball previously voiced Jasmine.)
- Grey DeLisle as Audrianna Flanagan
- Zoe Saldana as Clara Corona (revived by Barry)
- Dane Boedigheimer as Orange, Pear, Midget Apple and Marshmallow
- Justine Ezarik as Passion Fruit
- Bobby Jennings as Grapefruit
- Harland Williams as Apple
- Matty Damon as Knife
- Trey Parker as Stan Marsh / Eric Cartman / Mr. Garrison / Mr. Mackey / Randy Marsh
- Matt Stone as Kyle Broflovski / Kenny McCormick / Gerald Broflovski
- Mona Marshall as Liane Cartman / Sheila Broflovski / Sharon Marsh / Carol McCormick
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