News TV Videos GRIMM preview clips – Watch “Volcanalis” tonight on NBC Written by Lena Lamoray on April 26, 2013 “Volcanalis” – On the next new episode of Grimm, a demon arises and all hell will break lose! Meet Stefania Adalind crosses paths with a gypsy with sinister intentions. Related posts:Law & Order: SVU preview clip - "Poisoned Motive" tonight on NBCSNL Promo: Kevin HartREVOLUTION preview clips - Watch the season finale tonight on NBC