Star Trek V: The Final Frontier ( 1989 )
Capt. Kirk and his crew must deal with Mr. Spock's half brother who kidnaps three diplomats and hijacks the Enterprise in his obsessive search for God.
OMG, what a pitiful movie this turned out to be. Can't fault the cast, nor the effects, but the story was utter garbage and derailed the franchise in a way that I was surprised to see a sixth movie made, which thankfully redeemed the franchise. It's not unwatchable, but it's not great either - it almost matches the first movie in regard to how dismal it is. Try it and see what you think.