Later titles include "Avengers United" (later replaced by "Avengers Unconquered"), "Fantastic Four Adventures", "Marvel Legends" featuring Captain America, Iron Man and Thor, a new "The Mighty World of Marvel" as well as the introduction of the Ultimate Marvel imprint, consisting of "Ultimate Spider-Man and X-Men" (which was originally two titles, which merged since it was reprinting the stories too fast for Marvel US to print them) and "Ultimate Fantastic Four" (cancelled because of low sales, and because it was only a few issues behind the US title by the end).