Monsters Inc. is about a parallel world unbeknownst to human
beings called Monsters, Incorporated, a world of monsters who
creep up under your bed and spring out from closets when your
parents aren't looking. The monsters live by the screams and fear
that they get out of children. With the advent of the new century,
jaded children aren't that easy to scare anymore, so this world
is in jeopardy, experiencing their version of an energy crisis,
if you may. In comes our kind hearted hero monster, who simply
wants to help his fellow beings out. One night, monsters Mike
and Sully are doing their jobs, scaring kids, when they run into
a kid who isn't scared of them at all. In fact, she's been waiting
for the monsters to show up all night. She's always been obsessed
with the monsters, and wants to be one of them, and go around the
world scaring people. She's even made her own monster suit, and
wants to be called just by her monster name "Boo". Boo follows
Mike and Sully back to Monster World, where she convinces them to
train her how to be a good scarer. At first they don't want anything
to do with her, but pretty soon they soften up and let her go to
work with them in disguise. They have to keep her identity as a kid
secret, though, or else their boss, who is a big crab (literally)
will fire them for letting a human into Monster World. There are a
lot of close calls where Boo almost gets found out. Along the way
Boo meets some of the legendary monsters, like the Lock Ness Monster,
Bigfoot, the Abominable Snowman, and the Sea Serpent. She gets pretty
good at frightening kids, and starts to make a name for herself. Mike
and Sully are proud of their new "trainee". One night she gets assigned
to scare a kid that was a neighbor of hers in the Human World, and he
recognizes her and blows her cover. There's an uproar in Monster World
that one of the best scarers in the business is really a human kid. A
mob of monsters comes after Boo, and for the first time in her life,
Boo gets really scared. She sees that being scared really isn't a cool
thing, and realizes it was wrong for her to scare other kids. She talks
to the monsters about it. They realize she's right. They've been profiting
off of the misery of others all this time. Even if they're just humans,
they still have feelings. Boo goes back to her Human World life, happy
for the experience, but she's learned a lot about compassion.