Shin Sang-ok
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.