Wikimedia Commons/Monsters Inc 3 Movie Mike & Sully return in Monsters, Inc. 3! Plus, Pixar announces new original films: a folklore-inspired adventure and its first-ever musical. March 8, 2026 AceShowbiz - Monsters, Inc. is officially returning with a third installment in development at Pixar, according to The Wall Street Journal. Fans can look forward to more adventures featuring beloved characters Mike and Sully as the studio expands its popular franchise. Alongside the upcoming Monsters, Inc. 3, Pixar is also working on two original films not previously announced.