Since childhood, Mike had been very interested in the monster world, but he missed the chance to tour Monsters, Inc.
But he did not give up. He hid in a scream can cart and secretly crossed the boundary line, entering the children’s room.
Meanwhile, by an unexpected mistake, he ended up attached to the back of a boy named Boo and came to the human world.

The meeting of these two monsters led to strange and amusing happenings, but along the way, their friendship seemed to grow deeper.
In this way, the chaotic adventures the monsters went through seem to have brought great fun and laughter to children.
Mike had a passion for scaring even at a young age.
One day, he watched a performance by the scare champion and was deeply moved by what he saw.
The champion gave Mike his hat and offered words of encouragement.
Because of this, Mike came to dream that one day he too would become a scare performer.
Mike then entered Monster University, where he met a roommate named Randall.
Mike went on to major in scaring, where he met an intellectual named Sulley.
He came from a family of scare experts and had excellent practical ability, but he was not interested in theoretical study.
Mike, on the other hand, was weak in practical work but had a passion for theoretical study.
Because these two intellectuals had different strengths, they clashed in every class.
Mike caused trouble in the scaring department and ended up being expelled.
However, Mike tried to join a competition in order to return to the scaring department, but the other clubs would not accept him.
In the end, only the Roar-O-Ween club accepted Mike.
Then the dean proposed a bet to Mike: if he won the scaring competition, everyone would be transferred to the scaring department, but if he failed, he would have to leave school.
And then he ended up teaming up with Mike.
In the end, they became the strongest duo, and at the end they went into Monsters, Inc.