Remember that Tangled is a Disney movie.
Mickey never lived an easy life.
During the day, he stayed happily in the house.
At night, he fled Overtakers that wanted his power, his magic. Maleficent, Jafar, and the newcomer Mother Gothel chased him. He even fled the brooms from one of his earlier movies, Fantasia. Seriously! Who ran from brooms?
Apparently, those Kingdom Keepers did too.
Mickey was blindfolded and kept in a damp basement in Disneyland. But he heard rumors slipping through the tiny window. The Overtakers whispered hurriedly about five children. Five holographic children that fought them. With the snippets of conversations that he heard, Mickey could follow everything that happened. He knew their plan for the Magic. Everything.
He missed Minnie sorely. She had managed to escape the Overtakers that took him on the Night, a fact for which he was grateful. But she hadn't even seen them.
He missed Pluto as well. Pretty Ariel, who loved her show. Fierce Mulan, always ready for a fight. Even whiny little Dumbo seemed part of a dream now. A dream he desperately wanted to slip back into.
He waited, silent, waited as he heard more and more about the Kingdom Keepers, and came to pray they'd somehow rescue him.