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 with Donal Logue Hannibal preview clip - Eddie Izzard guest stars in tomorrow night's episode on NBC‘Saturday Night Live’ highlights – Don Cheadle and Gary Clark Jr.