Po's Mission is a mission Po McWince set himself on, to save the world from Susanne McWince. It involved adopting Mandy Sheer from her insane mother, after Susanne disowned her. Then, to constrict Susanne's physical form into JUST a soul, and to keep it locked away for years, as he trained Mandy in the art of alchemy. He trained her so that she could contain Susanne's soul inside of HER soul, locking it in. Mandy had no idea why he was teaching her alchemy, or even that Po was really her grandpa.