History MythologyGag / Supergirl2015

* Cat suggesting Supergirl could be Superman's girlfriend. In the comics, Post-Crisis Linda Danvers married a Silver Age Superman from another reality. Also, the song "Superman" by Stereophonics[[note]]which was in the ''Series/{{Smallville}}'' episode "Splinter"[[/note]] has the lyrics "sleep with a teenage blonde" (which might refer to Supergirl).

* The S-symbol is the crest of the House of El again as established by the Creator/ChristopherReeve ''Film/{{Superman}}'' films, but Kara specifically corrects Winn that "it's not an S" like in ''Film/ManOfSteel''. However, in the second episode it's said that the symbol means "stronger together" instead of "hope" as in ''Man of Steel'' (taken from the ''[[ComicBook/SupermanBirthright Birthright]]'' version of Superman's origin), which is unique to this show.
* Kara's first big superhero deed is to rescue a crashing plane, like Clark's in ''ComicBook/TheManOfSteel'' miniseries, in ''WesternAnimation/SupermanTheAnimatedSeries'', and in ''Film/SupermanReturns''. Christopher Reeve's Film/{{Superman}} also saved Air Force One on his first night. InUniverse, James notes that this was Superman's introduction to the world, too. The bridge Kara passed over while she was carrying the plane was called the Otto Binder Bridge (named after Supergirl's co-creator).

* The Omegahedron in "Better Angels" is taken directly from the ''{{Film/Supergirl}}'' movie.

-->'''J'onn''': No. No. If [[SelfDemonstrating/{{Lobo}} he]] were in town, [[WalkingDisasterArea we'd know]].

* Ruby Arias's school is shown in "The Faithful" to be named Davis Middle School. In ''Series/{{Smallville}}'', ''Davis'' Bloome was the human form of Doomsday, whose arc was similar to that of Ruby's mother, Sam/Reign.

** Supergirl attempts to end the conflict by digging up some ancient TrialByCombat law. Rhea tries to cheat in combat, while on the heroes' side, a WellIntentionedExtremist is working on a chemical weapon against the aliens. Mon-El survives the weapon, but the villain dies. In ''Series/LoisAndClark'', Kal-El was saved by his friends likewise digging up an ancient TrialByCombat law for nobility. Nor attempted to cheat by bringing in some soldiers. Meanwhile, a rogue general ordered to deploy a Kryptonite laced gas grenade against them. Superman survived, the bad guys didn't

* In "How Does She Do It?", Supergirl [[spoiler: flew to Maxwell Lord's window to confronts him on her suspicions of his involvement. Just like when Superman confronted Lex Luthor in ''[[Series/LoisAndClark Lois & Clark]]'' and ''WesternAnimation/SupermanTheAnimatedSeries''.]]

* There was some ShipTease between Kara/Supergirl and Olsen in the comics as well. [[spoiler:Same with Olsen and Lucy Lane.]]

* One that's easy to miss, from 1.14 (Truth, Justice, and The American Way): Kara, Hank and Alex are discussing the bad guy of the week -
-->'''Hank''': We could be dealing with an interstellar bounty hunter.

-->'''Hank''': No. No. If [[SelfDemonstrating/{{Lobo}} he]] were in town, [[WalkingDisasterArea we'd know]].

* [[spoiler: Lillian Luthor]]'s PoweredArmor in "For Good" looks exactly like Lex Luthor's in the comics. Winn refers to it as the "Lexosuit", suggesting it ''was'' his originally.

* In "The House of L", the Krasnian duplicate Supergirl is named as "Red Daughter" and given a costume with a hammer-and-sickle version of the S-shield, all references to ''Comicbook/SupermanRedSon''.

* In "The House of El", the Krasnian duplicate Supergirl is named as "Red Daughter" and given a costume with a hammer-and-sickle version of the S-shield, all references to ''Comicbook/SupermanRedSon''.

* In "Elseworlds Part 3", Kara and Barry slow time by running round the Earth and reducing its spin, a reference to Superman travellign back in time

* In "Ahimsa", when the Graves siblings are boasting about being in control, Otis starts to say "Welcome to Otisburg", which was the name of the town his movie counterpart added to Luthor's new West Coast.

* [[spoiler: Lillian Luthor]]'s PoweredArmor in "For Good" looks exactly like Lex Luthor's in the comics. Winn refers to it as the "Lexosuit", suggesting it ''was'' his originally.

* Mercy Graves, who was first introduced in ''WesternAnimation/SupermanTheAnimatedSeries'' as Lex Luthor's bodyguard and personal assistant, appears in season 4 along with a newly-invented brother named Otis, the same name as Lex's henchman in ''Film/SupermanTheMovie''.

** Speaking of, earlier in the season Kara was stopped from attempting the very same "drill spin" by J'onn, who phases her and Winn down to their target. She mentions that she heard her cousin did it once.

* The security measures outside the saferoom in the Luthor mansion in "Shelter from the Storm" match up to [[https://www.youtube.com/watch?v=psDtIYqya2w the death traps Lex Luthor had outside his hideout to test/deter Superman in the extended version of the 1978 film.]] Reign even used the "drill spin" trick to tunnel into the hallway with the security measures, the same way Superman drilled underground into the death trap corridor in the movie.

* [[spoiler: Lillian Luthor]]'s PoweredArmor in "For Good" looks exactly like Lex Luthor's in the comics. Winn refers to it as the "Lexosuit", suggesting it ''was'' his originally.