Having recently arrived in Cape Canaveral to await their parents' return from a three-year mission to Mars, Lincoln and Emmet meet on a beach in the middle of the night after having not spoken in years.
The boys return to the beach, still feeling each other out, and not sure of what they're doing or where they stand. Reminiscing brings out some tough truths along with some happy memories.
In the wake of the news about their parents, Lincoln has gone missing. Emmet returns to the beach in the hopes of finding Lincoln, and everything is put out in the open, leading to a big confrontation.
Emmet's aunt and Lincoln's dad join them at the beach on the eve of their moms' return. Then - the day they've been waiting for arrives, bringing changes for the future and promises made.