|Caption:||Nurse in 2267|
|Caption:||Doctor in 2273|
Chapel began her medical career aboard the USS Enterprise, sacrificing a biology career with several university degrees in research medicine. She became Head Nurse to Enterprise Chief Medical Officer Leonard McCoy in 2266.
When the Psi 2000 intoxication afflicted the crew of the Enterprise, Chapel admitted her love towards Mr. Spock, who was there upon emotionally shocked. Her love for him was an ongoing issue, which never interfered with her professional duties, though. (TOS: "The Naked Time")
In 2266, the Enterprise was sent to find Dr. Roger Korby, Chapel's lost fiancée, on the planet Exo III. His last communication contact had been made in 2261. When Korby was found, he was disocovered to be, in fact, an android. After the android died, Chapel doubted if she should stay aboard. She eventually elected to remain with the Enterprise, and she would become good friends with Uhura and Dr. McCoy. (TOS: "What Are Little Girls Made Of?")
Chapel once housed Mr. Spock's consciousness to keep him from being destroyed by Henoch. (TOS: "Return to Tomorrow") She was later forced by powerful telepaths to kiss Spock, but neither enjoyed the forced situation. (TOS: "Plato's Stepchildren")
When under the influence of the women of Taurus II, the male crewmembers of the Enterprise were incapacitated by the siren's song. Lieutenant Uhura took command of the vessel, and assigned Chapel to acting Chief Medical Officer. They led a landing party down to the planet's surface to rescue Captain Kirk, Mr. Spock, and Dr. McCoy. (TAS: "The Lorelei Signal")
When in miniaturized state, Chapel assisted Dr. McCoy mend Hikaru Sulu's broken leg. (TAS: "The Terratin Incident") When Captain Kirk and Mr. Spock were mutated into water breathers, Chapel assisted Dr. McCoy when he reversed their mutations. (TAS: "The Ambergris Element")
Following the Enterprise's five-year mission of exploration, she finished her own medical degree, and was promoted to Chief Medical Officer of the refitted Enterprise, now under the command of Willard Decker. However, when Dr. McCoy returned to the ship in 2273 during the V'Ger crisis, she willingly stepped down to allow McCoy to return as Chief Medical Officer. (Star Trek: The Motion Picture)
In 2286, Chapel was stationed at Starfleet Headquarters coordinating relief efforts while Earth was suffering a severe ecological "attack" from an orbiting space probe. (Star Trek IV: The Voyage Home)
- TOS: "The Naked Time"
- TOS: "What Are Little Girls Made Of?"
- TOS: "The Menagerie, Part I"
- TOS: "The Menagerie, Part II"
- TOS: "Operation: Annihilate!"
- TOS: "Amok Time"
- TOS: "The Changeling"
- TOS: "Journey to Babel"
- TOS: "The Deadly Years"
- TOS: "Obsession"
- TOS: "The Immunity Syndrome"
- TOS: "A Private Little War"
- TOS: "Return to Tomorrow"
- TOS: "By Any Other Name"
- TOS: "Spock's Brain"
- TOS: "The Enterprise Incident"
- TOS: "The Paradise Syndrome"
- TOS: "And the Children Shall Lead"
- TOS: "For the World is Hollow and I Have Touched the Sky"
- TOS: "The Tholian Web"
- TOS: "Plato's Stepchildren"
- TOS: "Wink of an Eye"
- TOS: "Elaan of Troyius"
- TOS: "Let That Be Your Last Battlefield"
- TOS: "The Lights of Zetar"
- TOS: "The Way to Eden"
- TOS: "Turnabout Intruder"
- TAS: "The Lorelei Signal"
- TAS: "Mudd's Passion"
- TAS: "The Ambergris Element"
- TAS: "The Survivor"
- TAS: "The Pirates of Orion"
- Star Trek: The Motion Picture
- Star Trek IV: The Voyage Home
Little canonical information exists about Chapel's life outside of her career in Starfleet. Simon and Schuster's Star Trek: Starship Creator interactive software listed some biographical details about her, such as a birthdate in 2237, Starfleet Medical Academy nursing degree in 2366 and doctorate by 2271. She graduated in the 98th percentile of her class, with degrees in bioresearch, medical archaeology, endocrinology. It assigns her original rank as a "brevet" (or provisional) ensign, and rose to become the director of Starfleet Emergency Operations by the time of her Star Trek IV appearance. It mentions he is the child of Lauren Chapel and Patterson Chapel of New Orleans, Louisiana, Earth; and has an interest in ballet.