I found 3 of these SERIES 1 mystery figures these at a local KB for $3 bucks each. I figured "ah why the hell not? They're mystery figures!" so I picked them all up. But I don't know who I have! (well sorta) After some searching, I found some answers... "On all of the Marvel Figure Factory figures, If you look in the lower left corner of the back of the card, you should be able to see a letter stamped/embossed into the cardboard. The letter is not printed, so you may have to wiggle the card around until the light catches the embossing just right." http://actionfigures.about.com/b/a/234971.htm Each of these letters represent a mystery figure. One box I have is "marked" (actually, imprinted) in the lower left corner with an "M". According to About.com & Toy News International, (http://adctalk.com/index.php?showtopic=1996063) This figure is M = Storm (Mohawk, black). Okay good. Now the other two I have are both marked in the lower left corner with an "X". Apparently, Toybiz also used the remaining letters of the alphabet (anything after "M"). Unfortunately, I don't have any info on and letters after "M" other than the letter "T" which is SERIES 1 Captain America. Now assuming in theory, if I apply Cap being "T" to TNI's list, then we skip the letter "N" resulting in something like this: A = Unmasked Spidey or "O" B = Doc Ock with Lab Coat or "P" C = Grey Hulk or "Q" D = Unmasked Wolvie or "R" E = Unmasked Venom or "S" F = Captain America or "T" G = Red Daredevil or "U" H = Yellow Daredevil or "V" I = Human Torch (Reg) or "W" K = Unmasked Human Torch or "X" L = Storm (White) or "Y" M = Storm (Mohawk, black) or "Z" *"N" is skipped.* Now if this assumption is true then my 2 letter "X's" should be: K = Unmasked Human Torch or "X" However, I'm only guessing here. So if anyone knows what other letters (after "M") these figures are represented under then that will be of great help to me. And just for the record, I do not plan on opening up these figures until I am absolutely sure of who is inside the package.