Kang's time line is pretty simple if you read Avengers Forever. First he was Rama Tut, then the FF kicked his ass and he went back to the future, along the way he met Doom, and got an idea to remake himself more in the image of his possible ancestor. When he got back, he missed his time by a couple of centuries, and found himself in a world where humanity had been defeated by an alien race and was nothing more than a scattered, unorganized people. So, he became Kang, and saved humanity, then pushed forward and conquered a thousand, thousand worlds. After that, he got kinda complacent. Decided to test his metal against the age of heroes, and so began his many battles with the Avengers. Kang may be a bad guy, but he is an honorable one. He wont take advantage of his time travel advantage. (As seen in the Kang Dynasty. Best Kang Story ever written. Read it if you never have.) Immortus and Kang are not technically the same person. Kang does not become Immortus. Immortus is a splinter of Kang. At the end of Avengers Forever, the Time Masters tried to age Kang into Immortus, but Kang, through shear force of will, split himself off from Immortus. So Immortus is more of an, aspect of Kangs personality really. Not Kang, so to speak. The Crimson whats his face was an alternate universe version of Kang. He was a Squadron Villain. His son, Marcus had taken over the mantel of Crimson Centurion for a time. But that's no more. At this point, Kang's just kinda looking for an aire. Somebody to carry on his legacy, which possibly lead him to mess with time that last time creating Iron Lad. Who better to carry on your legacy than....you? Heh. It's not that hard, of course I love time travel stories. Never had a hard time understanding them.