Marvel Team-Up Annual #1, Marvel Team-Up #53, Marvel Tales #262, Marvel Treasure Edition #26

Organizational Note: From now on, crossover comics aren't getting their own posts unless I find it particularly good (due to necessary lasting continuity, or I just find them personally amusing enough to talk about more), or there isn't any other crossover comics to group it in with. Most of these are not important enough to main plot stuff to be worth a full post.

Marvel Team-Up Annual #1, X-Men and Spider-Man Fight Accidental Indian Gods: In this one, the X-Men and Xavier are travelling on some important flight along with a bunch of different bureaucrats plus Peter Parker acting as a reporter. Dumb Science Stuff happens and a government program in the desert turns a group of scientists into ersatz Indian Gods. Spidey and X-Men Fight them, then use Phoenix's powers to launch them into space so the universe doesn't end.

Marvel Team-Up #53, X-Men Taxi Spider-Man to His Next Fight: Honestly this one is barely an X-Related comic. It is a Spidey/Hulk Team-Up, it just occurs right after the annual and Banshee drops him off at the fight and then leaves.

Marvel Tales #262, X-Men vs Desert Weirdos: The X-Men on their way back from the last two find themselves attacked by "Sunstroke" a super-powered guy in the desert who is hijacking planes. Silly fight, Sunstroke escapes, turned out he had a bunch of other weirdos like a living cactus and such helping him. (Note: This was actually written in 1992 as an extra backup story provided with reprints of the two above stories)

Marvel Treasure Edition #26, So Hercules and Wolverine walk into a bar...: Wolverine goes into a bar and is kind of a dick to a woman. Hercules walks in and all the ladies love him. They get into a fight cause Wolverine is grumby. They tear the whole place up and then decide to be friends cause good fight. They realize no one else is even there, so they sit down at the bar and have drinks. (Note: This was written as a Marvel UK fillin story, and didn't get published stateside until the Treasure Editions, which is how I chose to list it).

X-tra Notes: The Hercules and Wolverine one was the only one that felt like it was worth reading. They are all silly, but the Herc/Wolvie one at least seems self-aware of the fact.