We're Back! A Monster's Story is Yakko Warner's upcoming monster/human parody of the 1993 animated film We're Back! A Dinosaur's Story.
- Sulley (Monsters, Inc.) - Rex
- Eduardo "El Macho" Pérez as a Purple Monster (Despicable Me 2) - Rex as a "real animal"
- B.O.B. (Monsters vs. Aliens) - Woog
- Pyros (Hercules) - Woog as a "real animal"
- Mike Wazowski (Monsters, Inc.) - Dweeb
- Susan Murphy/Ginormica (Monsters vs. Aliens) - Elsa
- Timon (The Lion King) - Vorb
- Jack Skellington (The Nightmare Before Christmas) - Captain Neweyes
- Jesse Greenwood (age 12) (Free Willy) - Louie
- Lex Murphy (Jurassic Park) - Cecilia
- Oogie Boogie (The Nightmare Before Christmas) - Professor Screweyes
- Kronk (The Emperor's New Groove) - Stubbs the Clown
- Marion Cunningham (Happy Days) - Dr. Juliet Bleeb
- Babe - Buster
- Miss Piggy (The Muppets) - Buster's Mother
- Kermit the Frog (The Muppets) - Buster's Father
- Robin, Annie Sue (The Muppets), and Piglet (Winnie the Pooh) - Buster's Siblings
- Minion (Despicable Me) - Small dinosaur (Deinonychosaur) that Rex (as a "real animal") chases
- Rosie (Balto) - Sasha
- Rosie’s Mother (Balto) - Sasha's Mother
- Young Nala and Young Simba (The Lion King) as Cecilia and Louie as Chimpanzees
- Vitaly (Madagascar 3: Europe's Most Wanted) - Stubbs dressed as a Lion
- Littlefoot (The Land Before Time) - Louie in Gorilla South
- Ali (The Land Before Time IV) - Cecilia in Beast Suit
- Stefano (Madagascar 3: Europe's Most Wanted) - Stubbs in Alligator Suit
- The Sanderson Sisters (Hocus Pocus) as Two Hood-horned Women who run/grab the chained/hooked scepter during the end of Act 1
- The reason why Sulley plays Rex in this spoof is because both characters are voiced by John Goodman.
- Yru17 originally planned to re-edit this spoof, but when he retired from the Pooh's Adventures League, he also retired ever spoofing films after deciding that spoofing films is too much work for him, so Yakko Warner will make this spoof instead.
- The reason why this spoof will include the Illumination Entertainment logo taken from Despicable Me 2 is because a Minion will play a Deinonychasaur that gets chased by Rex (as a "real animal") and Eduardo "El Macho" Pérez's purple monster form will play Rex's "real animal" form.
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