I have some pretty mixed feelings about the modern Marvel Cinematic Universe.
Some of the movies have been exceptionally good. Others have been absolute garbage that should be tossed in a dumpster, covered with butane, and lit on fire. Most... well... few fell somewhere in the middle.
You know. Mixed bag.
But, with it known that the new "big bad guy" of the MCU will be a variation on Kang the Conqueror, I got the urge to re-visit the original stories of Kang (and the characters that led to Kang). For those interested... here is how (and when) Kang the Conqueror originally appeared.
That way, if anyone you know brings up the upcoming Ant-Man movie (or the Loki series... or any number of compcoming MCU shows that will all have at least something to do with Kang) you can knowingly drop some cool facts on them.
Because that's just fun.
October 1963 - Fantastic Four #19
The very first appearance of Kang the Conqueror... was under the name "Pharoah Rama-Tut" in Fantastic Four issue #19 back in 1963.
So. Who, exactly, was Rama-Tut?
His real name is Nathaniel Richards. He is named after an ancestor of his... also named Nathaniel Richards.
Who was the original Nathaniel Richards? He was Reed Richards' father.
Yes, that Reed Richards. Mister Fantastic of the Fantastic Four.
Which means that Kang the Conqueror and Mister Fantastic are family. Specifically Kang is Mister Fantastic's... great-great-(insert an unknown number of greats)-nephew. Kang should really call Mister Fantastic... Uncle Fantastic.
Which, coincidentally, is what I tell my nephews to call me.
Note: The familial relationship was never made 100% clear. For a while Kang also believed he was a descendant of Victor von Doom. Which was never fully refuted, but never fully confirmed either.
Nathaniel (the Kang one), is a time traveler -- how he became a time traveler is a complicated story involving Reed's father, Victor von Doom, and a bunch of other funky time travel stuff -- who spent a bunch of time in the year 3000 AD. People in 3000 AD didn't like him much. So he bailed on that time.
Nathaniel (Kang) then travels back to ancient Egypt in order to conquer that land... which he mostly succeeded at. This is why he took the name "Pharoah Rama-Tut". Almost immediately he is stopped by The Fantastic Four (who were also time traveling).
After being defeated, and losing control of Egypt, Rama-Tut travels forward in time to the 1960s. Where he wants to hang out with von Doom for a while. Because he thought they were family.
At this point... Kang doesn't yet take the name "Kang".
September 1964 - Avengers #8
Let's skip forward a couple issues, and almost a full year. September of 1964, and Avengers issue #8... and the first appearance of the name "Kang".
While this was the first time Kang would face off against the Avengers... it wouldn't be the last. Kang became a huge and key villain over the next few years. All of which included a whole lot of time travel.
Kang regularly got the best of the Avengers -- in their earlier encounters, Wasp was one of the few Avengers that managed to escape the grap of Kang. (Which as an MCU tie in, makes it somewhat logical that Kangs first major film has him facing off against Ant-Man and Wasp.)
November 1964 - Avengers #10
But "Kang" isn't the last name he goes by... just two months (and two issues) later, we find out the final name that Kang / Rama-Tut / Nathaniel Richards takes on... Immortus.
Immortus being a much, much later version of Kang -- from the far future. Same person... going by a different name after an unknown (but presumably huge) number of years have passed.
The MCU version of "Immortus" being "He Who Remains" introduced first in the Loki series.
As the years would go on the reality of "Kang" was expanded considerably. Including adding the idea that there were a huge number of Kang variants running all over time and space causing trouble.
Regardless of which "variant" we're talking about... or what name he goes by... one truth remains.
He's still the Great-Nth-Nephew of Mister Fantastic.