The Sharknadoes have been stopped, and Fin salutes into the sky in respect of his father, who is shown somehow having made it to the moon, where two dead sharks lie on the floor, while Gil is seen standing next to a rover of some kind. It's a blatant hint that he'll somehow find his way back home for Sharknado 4, because the kitschy appeal of The Hoff should never be underestimated.