Spec Ops Required Heroes

This serves as a reference list of required heroes for the Facebook version of the game.
 * Spec Ops 1: None
 * Spec Ops 2:, ,
 * Spec Ops 3:, , (X-Men Side);  (Avengers Side)
 * Spec Ops 4:, , ,
 * Spec Ops 5:, , ,
 * Spec Ops 6:, ,
 * Spec Ops 7:, ,
 * Spec Ops 8:, ,
 * Spec Ops 9:, ,
 * Spec Ops 10:, ,
 * Spec Ops 11:, ,
 * Spec Ops 12:, ,
 * Spec Ops 13:, ,
 * Spec Ops 14:, ,
 * Spec Ops 15:, , (Heroes Side); , ,  (Villains Side)
 * Spec Ops 16:, ,
 * First occurrence of a SO Hero, PvP Hero, General Recruitment Hero
 * Spec Ops 17:, ,
 * Spec Ops 18:, ,
 * Spec Ops 19:, ,
 * Spec Ops 20:, ,
 * Spec Ops 21:, ,
 * Spec Ops 22:, ,
 * Spec Ops 23:, ,
 * Spec Ops 24:, ,
 * Spec Ops 25:, ,
 * Spec Ops 26:, ,
 * Spec Ops 27:, ,
 * Spec Ops 28:, ,
 * Spec Ops 29:, ,
 * Spec Ops 30:, ,
 * Spec Ops 31: ,
 * Spec Ops 32: ,
 * PvP Hero, SO Hero
 * Spec Ops 33: ,
 * First occurrence of "themed" deploys with the younger heroes.
 * Spec Ops 34:, ,
 * PvP Hero, 2 SO Heroes. There were also two reward heroes for this SO.


 * Spec Ops 35:, ,
 * Spec Ops 36:, , (M1: E. Magus); ,  (M3: E. Thanos)