Since the 1990's prior to the Bandai Namco corporate merger, Namco maintained a series timeline that retconned and merged many of their futuristic space games that were previously unrelated to each other into a single continuity. Tentatively called the "Galaxian Universe" timeline, it later came to be known as the "United Galaxy Space Force" timeline. As of 2025, the timeline connects together the plots of numerous games and series including (mostly in chronological order on the timeline) Ace Combat 3: Electrosphere, Cyber Sled & Cyber Commando, Burning Force, the Galaxian/Galaga series (including Namco's Wonder Eggs amusement park ride turned arcade game Galaxian3: Project Dragoon), the Bosconian series, Bounty Hounds, Starblade, NebulasRay, the Dig Dug series, the Baraduke series, the Mr. Driller series, Star Luster & Star Ixiom, Mizuiro Blood, the cancelled game "Starblade - Operation Blue Planet", Shin-Gun Destroy! Girl's Tank Battalion, the cancelled game "New Space Order", Shadow Labyrinth, and Thunder Ceptor & 3-D Thunder Ceptor II.