The Culling

With Superboy, the Teen Titans, and the members of the Legion of Super-Heroes who are trapped in the 21st century captured in N.O.W.H.E.R.E.'s base known as The Colony, N.O.W.H.E.R.E.'s leader Harvest pits the young heroes against each other, in an attempt to weed out the weak, and use the survivors in his elite guard known as Ravagers.