3 Ninjas Knuckle Up

3 Ninjas Knuckle Up is a 1993 American martial arts comedy film taking place in between 3 Ninjas and 3 Ninjas Kick Back. The film was directed by Shin Sang-ok, using the pseudonym "Simon Sheen". The film was shot in 1992, the same year the first film was released, but was not released until 1995.