In the first "Divergent" movie, we only began to scratch the surface of why Tris (Shailene Woodley) was so dangerous to Jeanine Matthews (Kate Winslet) and her devious, smart-brained Erudite faction -- but from the looks of this brand spankin' new trailer, "Insurgent" will clear things up real fast.

"Dark times call for extreme measures," Jeanine says in the trailer, as Tris (with newly short hair!) and Four (Theo James) risk their lives in a variety of explosive ways.

Also appearing in the trailer is Ansel Elgort's Caleb, who warns Tris that her "Divergent problem" has grown beyond all control, and Naomi Watts as Evelyn Johnson-Eaton, Four's estranged, Faction-less mother.

Watch the trailer below, and be sure to check out "Insurgent" when it hits theaters on March 20.