Sleen

Bursting onto the scene in DC's Threshold #2 in 2013, Sleen is a creature of the Modern Age — born from the creative partnership of Keith Giffen and Tom Raney in one of DC's more daringly offbeat cosmic titles. Threshold was a showcase for the stranger corners of the DC universe, and Sleen fits right into that wild company, sharing pages with the likes of Captain K'rot, Ember, and Karel Sorensen. With only a handful of catalogued appearances, Sleen is a rare find — the kind of deep-cut cosmic oddity that rewards the dedicated fan willing to dig into DC's more adventurous edges.