Board Thread:Spoilers!/@comment-26159109-20160301190120/@comment-1916997-20160425164715

SEASON FINALE (MAY 15): In addition to tying up loose ends (including "What happened to the Camelot people?"), the two-hour season ender (airing at 7/6c) introduces Sam Witwer ( Smallville) and Hank Harris ( Popular) in a storyline that tees up "something new for Season 6," including "ominous threats that are different from ones we've experience before," Horowitz says.

Via this link:

http://tvline.com/gallery/may-sweeps-spoilers-2016-finale-episodes-photos/#!21/undefined/