As you were in the middle of playing Super Mario Galaxy, you eventually found that you weren't playing as Mario anymore, but as Luigi. You look around on Rosalina's ship and notice that the NPCs aren't there either. By the time you get to the library area, you then find what looks like Princess Rosalina, but she looks creepy and ghastly, and she had Mario’s severed head on a pike.

"Looks like you made it. I wasn't expecting you to get here so soon, but I don't mind. I was expecting you, after all."