Fresh out of Starfleet, the young and impressionable Chekov guides the Enterprise and heads security while also supplementing other areas onboard.
As helmsman, Sulu pilots the U.S.S. Enterprise during its five-year mission. As third officer, Sulu often takes command in the absence of superior officers.
The passionate Dr. McCoy uses the latest medical techniques to ensure the well-being of the Enterprise crew and all they encounter.