One of the coolest things about the 1970's were the Mego World's Greatest Superheroes action figure line. Heroes who I never thought would have an action figure had one during this time. The line started with mostly DC heroes but by the mid '70's Marvel brought out most of the main heroes like Spidey and the FF. My favorite Mego of all time was Thor.
He was fantastic. The likeness and costuming were spot on. Another favorite was Captain America and his trusty sidekick The Falcon.
There were a lot of great Megos. This commercial showcases all the greats. It's probably my favorite toy commercial of all time.
Also check out the Mego Museum, the ultimate site for all things Mego. Be prepared to spend a lot of time there.