Will Proudfoot lives with his mother Mary, a member of the strictly religious Plymouth Brethren who forbids him from corrupting influences like film, television and the radio. Consequently, Will retreats into his sketchbook, where he conjures imaginary worlds. At school, Will meets troublemaker Lee Carter, who has been abandoned by his parents. The boys spend the afternoon together, during which Will happens to watch a pirate copy of Rambo: First Blood. Inspired to imitate Stallone's muscle-bound killing machine, Will agrees to perform death-defying stunts in his new pal's homemade film.