Walking with Superman: Day 228

Challenger Mountain in Colorado has been many things over the years, from a secret hi-tech headquarters to a public amusement park, but today it houses the Institute for the Unkonwn, one of the world's premiere institutions for hands-on studies of fringe sciences. Here, the next generation of adventurers trains to study exobiological entities and explore the subterranean archaeology of hidden worlds. The faculty consists of those men and women who have cheated death and destiny time and again as the various incarnations of the Challengers of the Unknown, with the original five as professors and coordinators, overseeing the entire enterprise. And while it's not uncommon for Ace, Red, Rocky, June, and Prof. Haley to disappear for days while on another strange adventure, their most recent departure has been more abrupt and extended than usual. Superman arrives to find the Institute's students gearing up for the strangest search party in history. The Man of Steel agrees to accompany the young Challengers-in-training as they search the depths of time, space, and beyond for their missing teachers!