Summary:

Lockdown is a film based on the comic called School Bus Graveyard. It is a supernatural horror thriller story about a group of high school students whose after-school detention turns into a living nightmare when eerie chanting echoes through the halls and terrifying phantom creatures begin stalking the school. Armed with only improvised weapons from the drama room and each other, Ashlyn, Leon, Natasha, and Logan struggle to survive as they uncover the disturbing truth behind the chaos, their history teacher Mr. Thomas is conducting rituals fueled by his anger over a ruined reputation. After being attacked, hunted, and ultimately trapped in his ritual, the teens wake up to find the school seemingly returned to normal and their injuries mysteriously healed, as if they all experienced the same dream. As they leave detention, they realize the horror was real and whatever was unleashed inside the school may not be gone.