Where No Man Has Gone Before - S1-E4
Trivia: As the Enterprise encounters the field, Gary Mitchell is affected, and his eyes glow with an unknown, alien force. In the Star Trek The Next Generation novel "Q Squared", Q engages Trelane in a fight and is blasted backwards into the past, into a formless mass of energy. When the Enterprise encounters the energy at the edge of the galaxy, Q enters into Mitchel, giving him the power of Q.
Where No Man Has Gone Before - S1-E4
Trivia: This was the second pilot for the series, the first pilot being done with Jeffrey Hunter as Capt. Christopher Pike. This is also the first episode that has William Shatner as the famous Capt. James T. Kirk. The episode was made at the request of Lucille Ball, part owner of Desilu Studios, and friend to Gene Roddenberry, because she believed in the franchise.
Answer: Kirk was getting his physical and Dr. McCoy probably turned off communications, because if he hadn't, Kirk would have left and headed straight for the bridge, leaving McCoy irritated.