Who are the Squadron Supreme? Well, according to Wikipedia "The Squadron Supreme first appeared in Avengers #85–86 (February–March 1971) and were created by Roy Thomas and John Buscema." However, that is not the first appearance from these characters. You see, the Squadron Supreme is based off the Squadron Sinister a group of near identical members, except these guys were evil. Once again, according to Wikipedia "The Squadron Sinister first appeared in the final panel of The Avengers #69 (Oct. 1969) and were created by Roy Thomas and Sal Buscema." The Squadron Sinister consisted of four members, Hyperion, Nighthawk, Doctor Spectrum, and The Whizzer with each member based off one of DC Comics most popular characters. In case you couldn't tell which was which, Hyperion is based off of Superman. Nighthawk is based off of Batman. Doctor Spectrum is based off of Green Lantern. Finally, The Whizzer is based off of The Flash. Over the years they have added new members to the roster with Amphibian being based off of Aquaman. The Skrullian Skymaster, originally just The Skrull, being based off of Martian Man Hunter. Power Princess being based off of Wonder Woman. Golden Archer, originally called Hawkeye then the Black Archer, is baed off of Green Arrow. Skylark, originally Lady Lark, based off of Black Canary. Tom Thumb loosely based on The Atom. Blue Eagle, originally American Eagle then Cap'n Hawk, based off of Hawkman. Arcanna being based off of Zatanna. Lastly, Nuke is based off of the DC Character Firestorm. Eventually the Squadron Supreme got their own comic book limited series and added to their back story several villains based off of DC Characters as well as original creations with no DC Comics origins.
With that quick and basic introduction as to who the Squadron Supreme are, you may be wondering how and why Marvel would introduce them into the MCU. Well, there are two ways Marvel could use them to kill DC Comics hopes of getting a Justice League movie to be as big or even bigger than the Avengers. The first way would be to introduce them as a group of villains from another dimension that escaped into ours during an episode of Agents of S.H.I.E.L.D. With that basic set-up and a brief on screen appearance the stage would be set to debut the Squadron Sinister/Supreme in Avengers Infinity War Part 1. I'd have The Avengers brought together to face this team, then completely mop the floor with these DC analogues, showing that Marvel is the better brand. This could all be done in the first ten minutes of the movies with Iron Man quipping that they could have called in just him to deal with these "losers." The audiences world wide would realize these characters were basically the Justice League and DC Comics would be completely embarrassed and forced to reconsider their Justice League plans.
The second way, and the way in which I would want these characters brought out and used would be to once again introduce them in Agents of S.H.I.E.L.D. as a team of heroes from another dimension. I'd quickly show some highlights of their powers in action so we get a real sense of what they can do. I'd then debut the team in a Netflix or ABC produced series which would lead up to a full length feature film that sees the team leave their dimension and join the MCU with no hope of returning home thrown in for good measure. With a back to basics approach Marvel could give DC Comics fans the versions of their heroes they want and ruin the darker, grittier versions of the Justice League once and for all. Not only would Marvel kill off the chances of a Justice League movie they would gain DC Comics fans fed up with the distorted versions of the beloved characters they grew up with.
Well, there you have it folks, the sure fire way Marvel can stick it to DC Comics and Warner Brothers while also making a little money. Feel free to comment, like, share, or whatever other thing you kids do on your social media these days.
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