Made for boys who like watching kung-fu movies, this fantasy action-adventure is about a boy who loves his kung-fu movies. South Boston teen Jason (Michael Angarano, “Snow Angels”) fantasizes about a martial-arts adventure of his own. He’s a regular at Lu Yan’s Pawn Shop in Chinatown, where he seeks out rare kung-fu videos. In the back room there’s an ancient fighting stick the old proprietor says was entrusted to his grandfather. Defending the ornate staff from thieves one night, Jason falls from a roof and lands in the Forbidden Kingdom. Legend foretells a stranger coming to restore the staff to its rightful owner, although the prophecy does not relate that this stranger’s favorite adjective is “sick.” Jackie Chan and Jet Li play Jason’s mentors on a quest leading through the Gate of No Gate. Jason meets a funny drunk, an impish monkey-faced man and an embittered butt-kicking musician who hurls a mean jade dart. Rob Minkoff (“The Lion King,” “Stuart Little”) directs and John Fusco (“Young Guns,” “Hidalgo”) writes an exercise in juvenile escapism with nothing to say about kung-fu fandom. Aside from a few jokes for insiders, “Forbidden Kingdom” has no lineage in its genre. With Yifei Liu, Morgan Benoit, Deshun Wang, and Collin Chou. 113m. Anamorhpic 2.40 widescreen. (Bill Stamets)