Ryan Reynolds, Jeff Bridges Movie Sued By Crew ... You Busted My Back, Now I'll Bust Your Balls

Ryan Reynolds and Jeff Bridges thought "R.I.P.D." was dead and buried forever ... but it's reared its ugly head again ... in the form of a disgruntled employee who claims he was treated like a slave.

According to court docs ... "R.I.P.D." set designer Andrew Hamilton claims in a new lawsuit his back "popped" after being forced to hoist 100-pound steel doors up 3 stories.

He says the pop was the beginning of the end for him ... the injury rendered him unemployable.