I Solved It
Here's the way it will go down: In the end, everybody has died except Boyd. The monsters run him down and are now closing in for the kill. Close up on Boyd's terrified face. Everything goes black... Cut to Boyd's eyes opening, then widen to show his face. He's much younger. Shot widens out to reveal that he's lying on a beach. It's the beach camp from Lost. As Harold Perrinau's character Michael Dawson, he turns to his son, Walt, and says, "I had the weirdest dream..." Credits roll as old Bob Newhart Show theme plays.
You're welcome.