Regulus was an inhabited planet in the Alpha Leonis system, in the Beta Quadrant. In 2254, Captain Christopher Pike, in a conversation with CMO Boyce, spoke of retiring from Starfleet service and going into business on this planet. (TOS: "The Cage" , "The Menagerie, Part I" ; DIS: "Magic to Make the Sanest Man Go Mad") Regulus, the primary of the Alpha Leonis system, was located in the Beta Quadrant on a star chart seen in the Star Trek: Discovery episode "Magic to Make the Sanest Man Go Mad" }.