Walter finally learns Cabe’s long-kept secret regarding the Baghdad mission, and it threatens to tear Team Scorpion apart forever. Also, Paige’s world is rocked when Ralph puts his life in…

As Fred and Gunn search for Wesley, Angel searches for Sahjhan – and casts a spell to make him corporeal so he can be killed.

Jake, Charles and Gina are involved in a real-life “Die Hard” situation while off-duty on Christmas Eve, and Terry must leave his family celebration to try to save his squad….