In one of the marvel three-in-ones the thing is in the hospitol and averyone tries to come finish him off.

Marvel's Contest of Champions is a decent read and the first "Universe-wide Crossover" that the company ever did. Also, John Byrne's three issue Galactus arc of Fantastic Four (I think it's #s 248-250) is rather epic (and features appearances by several other Marvel regulars).

On the DC side of things, you also can't go wrong with Crisis on Infinite Earths, Final Night, and the currently ongoing Identity Crisis.

the john byre years of marvel team up had some great moments and some offbeat adventures.

There was a four-issue limited series of X-Men vs. the Avengers that was actually a three-way battle featuring the Soviet Super-Soldiers. This was during Magneto's stint as an X-Man around 1990. An interesting miniseries, and a strange little landmark in human-mutant relations as Magneto is finally put on trial for some of his crimes, only to be declared a sovereign nation.

Thanks guys, I loved contest of champions, both of them (except that Deadpool loses in the first round in CoC2 I think), and X-men v. Avengers.

And I'll check out those DC books and those Marvel team-ups, any really good ones in particular?

Ulvar mentioned

"In one of the marvel three-in-ones the thing is in the hospitol and averyone tries to come finish him off."

It's like issue 94 or 99 in Marvel Two in One and it's great. The cover is deceiving because it's kind of silly with a nurse Shhsh-ing people or something, but it's a great story to read.

Bravo for pulling out that obscure crossover.

And BTW, try FF 249 & 250. X-Men, Spidey, Gladiator, and some other fun surprises, too.

some other good crossover battle types are:

Onslaught vs all Marvel Universe
Maximum Carnage
Fatal Attractions (mostly X-Titles)
Bloodties (X-men and Avengers vs Exodus)

thats all i can think of at the moment...and yes, they're old...i havent been into comics for some years now :P