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It also teases where the MCU could be heading next in its two post-credit scenes.

Lets go over that surprise scene and what it all means.
So what happened?
(Which honestly is understandable, as Phastos himself points out that humanity kind of sucks.)
As he explains, his name is Eros and hes Thanos brother.
Who in the world is Eros?
Eros is the planets prince and ruler alongside his father, Mentor (once called ALars).
So hes really Thanos brother?
Like, by blood?
Why isnt Eros purple then?
In the comics, he was when he was first introduced!
But that later got retconned so that only Thanos was purple, to highlight his Deviant mutation.
Why is he hot?
The fact that Eros is very beautiful and Thanos is very ugly is constantly remarked upon in the comics.
And why is Eros called Starfox?
Its his Avengers code name, but its got a pretty ridiculous origin.
So the Wasp suggested Starfox, as hes a pretty foxy guy whos been out among the stars.
Listen, naming isnt the Avengers strong suit.
So Eros is for sure a good guy?
Eroshasconsistently sided with the Avengers, and has always stood against Thanos and his tyranny.
But whether hes a good guy himself is often a question in the comics.
In his earliest stories, he was portrayed as a shameless flirt, but still generally a stand-up guy.
Wait, and whos his weird little friend?
So whats next for Starfox?
But as a galactic wanderer, he could easily appear inGuardians of the Galaxy 3alongside Adam Warlock.