Although Power Girl didn't make an appearance on the series, there have been several references to the character and her universe. The notes on this page are generated by viewers and comics fans, but not necessarily verified by the show's producers or writers.
- Chloe refers to Tina Greer as "The Mighty-Morphing Power Girl".
- Clark's ship is showed to possess an A.I. mind, ability to morph and attacks Clark, forcing him to destroy it. Similar to Power Girl's symbioship in the comics.
- Chloe is shown to have created a database, over known and suspected meteor freaks, using a software program called Starr-Ware Database System 5.0, a reference to Karen Starr's company, Starrware.
- Molly Griggs screen name, Brainwave, is also the name of a long-standing comics foe of the Justice Society who has psychic powers including mind control. Brainwave was the main villain in both Power Girl's original appearance in All-Star Comics #58 and her first solo adventure in Showcase Presents #97-99.
- The human girl who Jor-El gives powers and uses to lure Clark to him is called "Kara", who's dressed in white and is passed off to Lana as Clark's cousin. At the time this episode aired, Power Girl's origin was that she was an genetically engineering person, who's powers caused her to be mistaken for Kryptonian and suspected to be related to Kal-El. Both speculations were later disproven by Batman. Ironically, Lindsey/"Kara" was played by actress Adrianne Palicki, who'd later go on to play Wonder Woman, in the unaired David E. Kelley pilot, where Diana's the CEO of Themyscira Industries (similar to Karen Starr being the CEO of Starrware Industires).
- Lois Lane, future wife of Superman is introduced. In the comics, Lois has had several superhero identities. In Superman #125, Lois dreamed about gaining Kryptonian powers, after a blood transfusion from Superman and assumed the guise of Power Girl.
- Introduces Aquaman, King of Atlantis. Following Crisis on Infinite Earths, DC Comics adopted a policy that Superman was to be the only surviving Kryptonian. Writer Paul Kupperberg created a new Power Girl origin, in 1987, that established that she was a genetically engineered person, from ancient Atlantis. This origin was canon until Infinite Crisis, restored her as an Earth-Two Kryptonian.
- Geoffrey, an old friend of billionaire Oliver Queen's, tells he needs to get back to Gotham. Gotham City being Power Girl's original base of operations and where she first landed on Earth-Two.
- Chloe says that Artemis Global Consortium is part of JL International. Power Girl was a member of JL International, one of the incarnations of the Justice League.
- In Clark's delusion, Lex is shown in a wheelchair. Power Girl villain, Ultra-Humanite, was originally a bald man in a wheelchair.
- Kara's ship is based on Power Girl's symbioship.
- Like her modern-day comic book counterpart, this version of Supergirl borrows the concepts of having been in suspended animation and educated en-route by the ship's computors.
- This episode introduces Tess Mercer, a young woman who worked herself up from nothing to CEO of a billiondollar company. Similar to Power Girl's secret identity, "Karen Starr". Interestingly, Tess is a redhead, which is the same hair color as Karen's business rival Ophelia Day (CEO of Day Work Industries) and Karen herself, after Superman told her she needed to put more of an effort into her secret identity.
- This episode introduces the Legion of Super-Heroes. Briefly before the restoration of her Earth-Two origin, Power Girl was confronted with false version of those three, who claimed that she was Legion member Laurel Gand, who had traveled back in time to the present on a mission. Episode writer Geoff Johns was the writer of that story.
- Garth Ranzz mentions "the Levitz Museum", a reference to Comic Book writer Paul Levitz, who created Power Girl's origin (her original creator, Gerry Conway, never touched upon it, before leaving) and gave her the names "Kara Zor-L" and "Karen Starr".
- Absolute Justice, Part 1
- This episode introduces the Justice Society of America. Power Girl was the first new recruit to both the Earth-Two JSA and the New Earth JSA. She was also their very first (and to date only) female chairperson.
- The Star-Spangled Kid appears in the first hour. The SSK served on the JSA and its legacy team Infinity, Inc. alongside Power Girl. He also had a longtime crush on her.
- Lois mentions Michael Holt. In the comics, Michael's known as the second Mister Terrific, first African-American member and chairperson of the JSA. Most recently, he's begun dating Karen Starr.
- When trying to come up with a better name for Kara, Lois suggests "Power Girl".
- Kara is seen disguising herself with a wig and glasses. Prior to the Post-Flashpoint reboot, Power Girl wore a red wig and glasses to disguise herself as "Karen Starr". She also briefly wore glasses in the late 80's.
- Introduces an alternate reality, that Lois names "Earth-Two". In the comics, this is the name of Power Girl's native reality.
- The Daily Star is mentioned and showed. In Power Girl's native dimension, her cousin Kal-L worked at the Daily Star. Towards the end of her self-titled Comic Book series, Karen Starr acquired the Daily Star as part of a media network.
- Chloe makes mention of having previously met "a wonderous woman who will throw you [Clark] for a loop" and "A billionaire with high-tech toys". They allude to Wonder Woman and Batman. In her native dimension, Batman's the father of Power Girl best friend, Helena Wayne (Huntress).
- While battling Clark, Oliver wears a shoulder armor similar to Power Girl.
- Lois Lane briefly gains Kryptonian powers, like she did in Superman #125 (among other times).
- Lois wears a red puncho, similar to Power Girl's red cape.
Chloe is played by actress Allison Mack, who did the voice for Power Girl in the movie Superman/Batman: Public Enemies. Interestingly, there are similarities between Karen Starr/Power Girl and Chloe Sullivan. Both are short-haired blondes, as well as during the middle seasons, Chloe spots Power Girl's bob hairstyle. Both are extremely skilled when it comes to computors. Chloe's role on Smallville in later years is similar to that off Barbara Gordon (Oracle). In the comics, Power Girl was one of Oracle's first operatives, which ended badly. While being among the three female leads (along with Tess and Martha), to never gain Clark's power or possess natural Kryptonian powers (i.e. Kara Kent), she did briefly possess Kryptonian-like powers, in Legion, while she was possessed by Brainiac, during which, she wore her white wedding dress.