Mego’s Mad Monsters line was limited to just four figures, Frankenstein, The Wolfman, The Mummy and Dracula. All four were 8 inch articulated fingers. They also had glow in the dark hands and eyes.
Like most of Mego’s toys, the figures came in a number of different packages, solid box, window box, and two different blister cards. I’m only aware of one playset, the Mad Monster Castle, that was a repackaging of the castle for the Knights line of toys.