In a small town in Massachusetts, four high school girls perform a ritual in an attempt to debunk the lore of Slender Man. When one of the girls goes mysteriously missing, they begin to suspect that she is, in fact, his latest victim.
Aspiring college cheerleader, Cassie Stratford consumes an experimental drug that grants her beauty and enough athletic ability to make the cheer squad. The drug has an unforeseen side effect — Cassie starts to grow and grow and grow!
