User blog comment:TheVision185/Mavel: Avengers or not?/@comment-4651179-20121104162403

Well... Mr. Fantastic and Inivsible Woman joined the Avengers temporaly around the 90s, and The Thing joined the New Avengers in 2010s. The only fantastic left is the Human Torch.

There aren't many X-Men Avengers, but that changed with Marvel NOW!. The first X-Avenger was Beat (around the 70s, I think), then Wolverine, then Storm (who left the team in AvX). Now Havok and Rogue will be members of the Uncanny Avengers, and Cannonball and Sunspot members of the main Avengers team.

In the Mainstream Universe there aren't Ultimates, only in the Ultimate Universe, being the Ultimate incarnation of the traditional Avengers, although the Ultimate Avengers exists (but they are a Black Ops team totally different from the Ultimates).

Spider-Man, Power Man, White Tiger and Iron Fist aren't Ultimates in any universe. In the animated series Ultimate Spider-Man they are just a team of S.H.I.E.L.D. trainees, but they are never a named team. Not in the Mainstream Universe nor in the Ultimate Universe those four heroes are a team.