When the sequel to the 2001 Pixar film, Monsters, Inc., premiered on Disney+ on June 7, viewers desperately wanted to know if Boo (voiced by Mary Gibbs) might appear in Monsters At Work.

Mary Gibbs, the toddler who voiced Boo in Pixar's 'Monsters, Inc.' has found a second act as a fire twirler, performer and VJ. Learn more about her career here.

As the theory suggests, following the events of Monsters, Inc. Boo never really got over her adventures with Sulley, but remembers that wooden doors are the key to accessing him.