The original idea for the game was to replace Chell with a new protagonist named Mel. Cave Johnson was to replace GLaDOS as the antagonist, and Mel was going to have many different personality spheres follow her (such as the Adventure Sphere, Betty, and one referred to as the "Morgan Freeman Sphere") instead of just Wheatley. Play testers were up for the idea of Mel until they became disappointed when GLaDOS woke up and didn't recognize the player as the character that defeated her in the first game. Mel was then put in the multiplayer before being scrapped entirely and replaced with Atlas and P-Body.