While partying on a bachelorette getaway with her friends, bride-to-be Casey is bitten by a mysterious, unseen bug. On returning home what first appears to be a nasty infection rapidly mutates into something far more sinister as Casey takes on a horrific insect-like transformation. Shedding skin, vomiting acidic bile, biting off nails and excreting slime drenched eggs all over her newly created nest; Casey must now find flesh to feed on.