2270s

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Prime Chronology

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2270

January

U.S.S. Enterprise (TOS 10)

Stardate 5483.7 (1-2 January): Investigating a sector of space where starships have disappeared every 27 years, the Enterprise finds a race of beautiful women living on a hidden planet. (TAS 06)
Stardate 5554.4: While visiting the newly discovered planet Phylos, Lieutenant Sulu picks up a walking plant, called a Retlaw, and is poisoned. The alien species that inhabits the planet, who are also plantlike beings, approach and save Sulu's life. (TAS 02)
Stardate 5592.1: The Enterprise crew revisits the "amusement park" planet, hoping for some rest and relaxation. (TAS 14)
Stardate 4978.5: The Enterprise receives orders to arrest Federation outlaw Harry Mudd, who is accused of selling fake love crystals. Intercepting Mudd on the mining colony of Motherlode, they bring him aboard the Enterprise. (TAS 08)

February

Stardate 1254.4: While exploring near the center of the galaxy, the Enterprise is caught inside an energy/matter vortex and all her computer systems fail. A being named Lucien appears on the bridge, repairs the ship's systems and takes the crew to explore his planet, Megas-Tu. (TAS 09)
Stardate 5577.3: While observing a burned-out supernova, the Enterprise picks up a strange message transmitted in a two-hundred-year-old code. (TAS 15)
Stardate 5267.2: While exploring the Delta Triangle, where many starships have disappeared, the Enterprise is attacked by several Klingon vessels. During the battle they are caught in an ion storm. The Enterprise and one Klingon battlecruiser are drawn into a spacetime vortex and end up in a timeless dimension. (TAS 10)
Stardate 5392.4: While the Enterprise escorts two robot cargo ships carrying quintotriticale, a new seed grain, to famine-stricken Sherman's Planet, it encounters a Klingon battlecruiser pursuing a Federation scout ship. When the Enterprise rescues the pilot, the Klingons attack with a new energy weapon and demand that the pilot be handed over to them. (TAS 01)
Stardate 5499.9: While exploring the water planet Argo, Captain Kirk and Mr. Spock are transformed into water breathers by the planet's undersea inhabitants, the Aquans. In order to return to their normal selves, they must enlist the help of the Aquans to capture a giant sur-snake, whose venom holds the antidote. (TAS 13)

March

Stardate 6334.1: Spock contracts a fatal illness, and the cure can only be found with dangerous Orion pirates. (TAS 19)
Stardate 5683.1: The Enterprise arrives at the Vedala asteroid, where Captain Kirk and Mr. Spock have been summoned to learn about a stolen religious artifact, the "Soul of the Skorr", whose theft could ignite a galactic holy war. (TAS 12)
Stardate 5275.6: Doctor McCoy is arrested for allegedly causing a deadly plague, which once ravaged the planet Dramia. (TAS 18)

Holographic Rec Room (TAS 20)

Stardate 3183.3: A strange energy field causes the Enterprise computer to play practical jokes on the crew, but the humor soon turns to danger. (TAS 20)
Stardate 6063.4: A mysterious being threatens to destroy the Enterprise if the crew is unable to solve an ancient puzzle. (TAS 21)

April

Stardate 6770.3: An unusual spaceship pulls the Enterprise into a "negative universe" where time seems to flow backwards. (TAS 22)
Stardate 5501.2: The disappearance of a scientific team lures the Enterprise to investigate near Lactra VII. The starship Ariel is located there, abandoned, with its captain having transported to the planet's surface. (TAS 16)
Stardate 7403.6: The Enterprise crew is taken captive by a primitive race on a newly discovered planet. (TAS 17)
Stardate 4187.3: In the Shuttlecraft Copernicus, Mr. Spock, Uhura, and Sulu are en route to Starbase 25 to deliver a stasis box—a rare artifact of the Slaver Empire—when the Kzinti intervene. (TAS 11)

Reference Stardate 2/1204: The U.S.S. Enterprise NCC-1701 ends its Five Year Mission under Captain James T. Kirk, and enters spacedock for an extensive refit. (VOY 265; ST01)

2273

U.S.S. Enterprise (ST02)

Stardate 7410.2: A massive energy cloud advances toward Earth, leaving destruction in its wake. The Enterprise is ordered to intercept and discover what lies within. (ST01)

Notes

The order given for the episodes of Star Trek: The Animated Series is taken from the novelizations, which included chronological references and additional story elements. While the novelizations gave new (and more consistent) stardates, the stardates given in the original episode have been retained.