If the movie follows the rules of Ghostbusters, the Terror Dogs only track one person each; the Gatekeeper and the Keymaster.
This latest trailer added one Easter egg that has created space for a theory about the part Paul Rudd plays in the proceedings, and again it all links back to events of the original Ghostbusters movie.
These two possessed hosts then play an important part in opening the portal which allows Gozer to enter the world.
Ghostbusters: Afterlife released an international trailer recently and with it came a doubling down on the nostalgic feel that the movie brings as we were delivered deep into the Gozer mythology of the original 1984 comedy horror film that started the franchise.