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When Mega Construx did Castle Grayskull, they included the Filmation Sorceress and themed the other pack-in figures around the first mini-comic, "He-Man and the Power Sword."
So if we're lucky enough to get Snake Mountain solicited to retail, how are they going to theme the pack-in figures? the place first appeared in Filmation and they've already done F. Evil-Lyn, Trap Jaw and only slightly inaccurate renditions of Skeletor and Beast Man (right colors but toy lower legs instead of human boots).
Maybe Skeletor with human boots and an extra Keldor head, Kobra Khan and Classics-style parts-swapping King Hiss that can count as two figures? I suspect they'd want a minimum of 5 figures, but that's a good start.
