It was epically long, and incomplete. The basic plotline was as follows:
Finn and Quinn are in the chemistry lab when something goes wrong in the experiment she was working on. There's an explosion, and they wake up in each other's bodies. It goes through them dealing with each others' lives, gender and sexuality issues, religion, and how they improve the lives they've been forced into. Brittany and Kurt are the only ones who know they are them, and it has a strong Faberry subplot.