You were in the Ghost Zone, but you ended up in Walker’s prison, as you were pushed by his guards in Walker’s office.

Warden Walker: This is a very important prison, a place for dangerous ghost. You have committed some pretty egregious crimes, and we don’t want you to do that again, do you understand? If you do not heed our directions, we will make you suffer! Walker slammed his fist on his desk, and made an example of how serious he was. We don’t play games here… He looked at the prison file sheet in his hand.