What would you do if you met your doppleganger? +1 starts out like any other teen / party movie but it flips when they get stuck in a time loop with physical copies of themselves.

Here's the synopsis:
Three college friends hit the biggest party of the year, where a mysterious phenomenon disrupts the night, quickly descending into a chaos that challenges their friendships — and whether they can stay alive.
+1 hits theaters on September 20th.