With the crew in need of shore leave, Kirk directs the Enterprise for a return visit to the Amusement Park planet, but it shortly becomes evident that the planet is no longer welcoming when it takes Uhura hostage and sends characters to remove Dr. McCoy's head. The caretaker has died, leaving an artificially intelligent computer to take charge, a machine operating under one or two important misconceptions.
Did You Know?
Scotty operates the transporter controls, but at 8:10 when the shot focuses on his hands, it's the absent, mustached Lt. Kyle who operates them. See more
I think it prudent to remember that, on this planet, anything we think may be used against us. We must monitor our thoughts and give our enemy no more ammunition.