I got these a few years back, when the economy was better and I had the extra funds.
I recently did some digging to find them.
First up is the 1999 Dr. X with the crushing hand. I got this one loose, later in a job lot
I got another that's still on the blister card.
The green "wing nut" makes his hand close, and then one more click and it opens.
His left eye is red.
There are two from 2001 (according to a website, don't remember which), the first called the copper X.
This one has a ball on a chain, and his left arm has click stops. One the arm is positioned
a slight rotation is spring loaded, and he throws the ball and chain.
The second figure is called Silver X (according to the same site), he has a hard
plastic coat and a missile firing hand.
The hand has four missiles, and all four fire at once from a single button.
Last but not least, the Dr. X from 2002. I got all of these figures loose.
This figure has his gun, and even came with an instruction sheet. He has a lever
and a button on his back. The lever drops his chest to reveal a weapon and the
button retracts the weapon back into his chest.
The instructions and the holes in the chest weapon shows that he had two
missiles, but I didn't get them with the figure. It would be nice to have them.
A simple push drops the chest part way, pushing it all the way down I'm guessing
fires the missiles as the chest falls farther down.
I though I had more Dr. X figures than these, but they were what I found.