It appears there were two series of figures. The first had the red plastic "X" figure stand. The second had the silver "X" stand. The plastic stands are way too flimsy to actually hold a figure. Most of the silver series came with a dog-tag with the characters name on it.
For almost all of these first series figure, it comes with a fairly large accessory piece. Jean Grey comes with a mutated Senator Kelly which is quite gross. This is also the bustier long hair version of Jean Grey that was pulled shortly after release. The short haired, bust painted over like a short came out afterwards.
Mystique comes with a Wolverine figure. Well, I thought it was a full figure but it was a full rubber costume that slides over the Mystique figure. Kind of cool.
Cyclops comes with a slime covered Jean Grey.
Rogue comes with a cloth overcoat and scarf.
Storm comes with a stormy background. Hate how her legs are non-articulated and crossed/bow legged.
Wolverine comes with a base of metal junk that Magneto wraps around him.
The second version of Cyclops in civilian clothes at the train station battle.
Magneto looks great with a wired cape but his hair is too dark. And his hands are really big.
Toad comes with slimy spit you can throw onto his enemies. Played by Ray Park who also played Darth Maul in the Phantom Menace.
There are two versions of Sabertooth - regular and snow covered. The regular Sabretooth comes with a police officer with knock out action (basically a multi-articulated figure with strings through it like a marionette. You wind it up to straighten up the figure but then when you punch it, he falls to the ground all limp. Weird.) The snowy Sabretooth has a fur jacket. Don't tell PETA.
Professor X comes with a translucent, plastic "anti-magnetic" wheelchair.
Rogue vs Wolverine 2-pack recreates the scene where Rogue wakes Wolverine up from a nightmare and he stabs her through the chest with his claws as he is startled awake. She uses his healing power to save herself.
Finally, my favorite Rogue figure in her X-Men outfit. Most importantly, she is wearing boots. Not sure why toy manufacturers still make female superheroes wearing high healed shoes/boots?