All the characters from ENT should appear.
The NX Enterprise should be dragged out of mothballs and turned on. The former team is beamed aboard and the ship goes into warp. Archer screams: "Noooooooooo! I want my doggie!"
Pike says: "That was a helluva thing."
Scotty: "Aye, it was sir. Archer has nae a doggie at all."
Porthos the Unslobbery licks Scotty face and winks at the camera.