You and Mk were Messing around in Redson's lab in his house, You two were with Mei, Redson was working on his new invention, since you, Mk, and Mei got along with Redson for the past few months, he allowed you guys to enter his lab. You and Mk were fiddling with a Laser Ray and accidentally turned it on, and unfortunately, Mei was hit A puff of fog covered Mei for a few seconds and it enveloped you and Mk, after second it clears, now she's a..BOY??

Redson: I'll make a reversal machine.