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The Alpha Leonis system, also known as the Regulus system, was an inhabited planetary system in the Beta Quadrant. Notable forms of life in this system included the eel-birds of Regulus V and the Regulan bloodworms of Regulus II. (TOS: "The Cage", "The Menagerie, Part I"; TNG: "The Vengeance Factor"; Star Trek VI: The Undiscovered Country production art; TOS: "Amok Time"; ENT: "Two Days and Two Nights") The system was located three hundred light years from the Bajoran system. (DS9: "Fascination")


In 2154, a Vulcan High Command attack fleet massed in this system in preparation for an abortive preemptive strike against the Andorians. Regulus was the closest accessible star known to be outside the maximum range of Andorian Imperial Guard listening posts. (ENT: "Kir'Shara")

A century later, in 2254, Christopher Pike considered retiring and going into business on Regulus or on the Orion colony. (TOS: "The Cage", "The Menagerie, Part I")

In 2257, during the first Federation-Klingon War, this system was occupied by the Klingons. (DIS: "The War Without, The War Within")

In 2259, the location of this system was labeled on a stellar cartography chart that was seen on the USS Enterprise's ready room viewscreen. This system's symbol had a blue color, indicating that it was affiliated with the United Federation of Planets. (SNW: "Strange New Worlds", "Children of the Comet", "Spock Amok")

In 2293, the location of Regulus in the Milky Way Galaxy was labeled in a star chart that was in Captain James T. Kirk's quarters aboard the USS Enterprise-A. (Star Trek VI: The Undiscovered Country okudagram)

In 2366, this system was in need of medical supplies, which were transported there by the USS Enterprise-D. (TNG: "The Vengeance Factor")

Prior to 2371, a science academy was founded on Regulus III. In the opinion of Commander Benjamin Sisko, the CO of Deep Space 9, this was a good school. (DS9: "Fascination")

The system's location was labeled in a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters in 2399 and on the bridge of the USS Titan-A in 2401. The Regulus system was in or near to Federation space. (PIC: "Maps and Legends", "The Next Generation", "Disengage")

In 2401, this system's position was labeled on a star chart used by Captain William T. Riker during his attempt at finding the last known location of the SS Eleos XII. (PIC: "The Next Generation")


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Background information[]

The connection between the Alpha Leonis system and the star Regulus was established in the Star Trek: Discovery episode "Magic to Make the Sanest Man Go Mad".

According to Star Trek: Star Charts ("United Federation of Planets I", pp. 56, 61, and 62) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), in the late 24th century, the system was a destination on the major space lanes. The planets Regulus III and Regulus V were listed as Federation members.


According to the novelization of the episode TOS: "The Man Trap" in Star Trek 1, the planet M-113 was the eighth planet in the system, Regulus VIII.

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