Stephen Baldwin is suing fellow actor Kevin Costner for tricking him into selling his shares in Costner’s company Ocean Therapy.

In the suit, Baldwin claims that Costner cheated him out of his shares of an oil-filtering invention which Kevin Costner sold to BP during the disastrous oil leak.

Baldwin claims that Costner lied about his plans to sell the machines to BP when he purchased Baldwin’s shares back … and now, Stephen wants to receive monetary damages.