 Kirk authorizes shore leave for his very weary crew. The planet is earth-like and supposedly uninhabited but all crew members start seeing strange apparitions. McCoy sees a large rabbit, right out of Alice in Wonderland. Kirk runs into Finnegan, his old nemesis from academy days and Ruth, a long lost love. Yeoman Barrows is attacked by a Don Juan-like figure and Sulu encounters a samurai warrior. Things take a more serious turn however when the Enterprise suffers from a power drain and McCoy is apparently killed by a medieval knight.