In one place there were beings from each dimension appearing

Michael Dean: Alternate Michael possessing Dean "where am I"

Lucifer: Original Lucifer Possessing Nick says "oooh, we're in a room~"

Michael Adam: Original Michael possessing Adam looks at Lucifer "ah brother you there"

Casifer: *Castiel possessed by Lucifer" "Two Michaels?"

Samifer: Sam being possessed by Lucifer says "hmmmmm.... Interesting"

Lucifer endverse: Lucifer from the end universe possessing Sam "Cool"