After 8 castles later, Bowser finally arrived at the castle as Midbus was waiting for him.

Midbus: Well, well, well, look who’s finally shown up.
Bowser: I’m here to free Princess Peach!
Midbus: If you w- wait… Bowser, I didn’t kidnap Prin-

Bowser defeating and interrupting Midbus as he breathes fire at him. Midbus stayed down on the ground, and Bowser grabbed a key to free Princess Peach from him.

Bowser: Midbus, you’re the most pathetic villain of my life.*walks away to rescue Princess Peach*

Bowser, Midbus © Nintendo