Paradise X #10 (2003)

Story: Alex Ross & Jim Krueger
Pencils: Dougie Braithwaite
Inks: Bill Reinhold

Reed and his friends are approaching Paradise from within the Negative Zone. Arno Stark agrees to help Vance Astro to use radiation to activate the dormant mutations in humans in his world, so that they can fight off the future alien invasion. The Skull finally joins up with Cap, and after killing King Britain with Excalibur, Mephisto is ready to control Jude! Meanwhile...Matt Murdock tries to talk some sense into the dead Frank Castle.

She-Hulk #3 (100) (2005)

Story: Dan Slott
Art: Far too many to list!

While on trial for tampering with the timeline too often, She-Hulk is led past the Time Cells, where other temporal criminals are kept in solitary confinement. One such criminal is the Iron Man of 2020. Stuck in a repeating time loop, the armored captive is left shouting "[You] can't do this to me, I'm Arno Stark!" over and over again.

Exiles #83 (2006)

Story: Tony Bedard
Pencils: Casey Jones
Inks: Vince Russell

An alternate version of the Iron Man of 2020 makes an appearance here, wearing all-new armor! It seems the Exiles team captured him at some point in the past, and rather than be sent back to his own world (where he's considered a war criminal), he tricks the team. Too bad they end up getting the better of Iron Man and sending him back anyway.

(Note: This Iron Man is not the original Arno Stark, nor does his armor look anything like the classic 2020 armor. In the book, it says he comes from the parallel universe of Earth-2020; the original Iron Man of 2020 is from Earth-8410.)

ToyFare Magazine #117 (2007)

Alright, it's not technically a comic book, nor does this story even take place in proper Marvel continuity, but it is hysterical! May 2007's Twisted ToyFare Theatre tale, the Iron Man of 2020's among a group of futuristic characters being led around the present day by their time-tour guide...Kang!