Adam-Geddon is also the first of the four Themed Series sets to contain less than 220 cards. At 180 total cards, I think that GPK has taken a step in the right direction. Too many characters seems to dilute creativity, and forced hurried ideas. The Original Series (1985-1988) and the All-New Series (2003-2007) typically only introduced 80-something cards with each release.
With 2017 Series 1, Adam Bomb and Adam Geddon can be found as cards #17a and #17b in the Nuclear Stickers subset which contains 18 different pairs of characters.