In the midst of a stand-off with the Rimulans, The Enterprise's computer systems, gain partial sentience, and with it, starts playing practical jokes upon the crew, which leads to a dangerous life-and-death battle with Romulans.
Did You Know?
Gene Roddenberry had intended to introduce a holodeck-type room in the third season of Star Trek: The Original Series; however, budget constraints prohibited it. See more
At one point Lt. Arex has the conn, but no-one has replaced him at his navigation console. See more
We're giving it a mighty go with the crowbars though!