Half (2012)

Jake Russel, Dawn Sullivan, James Anderson, and David Kurtis meet each other in a Boulder Point city park one summer afternoon. Shortly after starting a fight with the others, James discovers a hidden staircase leading to an ancient cave. A hidden orb transforms the teenagers into mythical creatures and before long, U.N.I.T. investigators led by Randall Stephens track them down. Will the mystery bring this band of unlikely losers together before their personalities tear them apart?