Head: Chap Mei
Body: Star Wars Preview General Grievous (feet are Chap Mei)

Part of the reason I love Action Force as much as I do is the sheer absurdity of some of the concepts. A giant skull that flies through space, sea monsters, and a robot skeleton. The original figure was under articulated, at least for my taste, and though I've seen others make Skeletron using Star Wars Battle Droids. That route didn't appeal to me. I'd put the idea aside, waiting for something to present itself, and finally it did. The Preview Grievous was perfect. Good, skeletal sculpt, and fairly close to Joe articulation (I may have to go in and give him some elbow joints someday). The rest, well, you can see.