Trial by Fire

"" is the thirteenth episode of Season 4 of Grimm and the seventy-ninth episode overall. It first aired on February 13, 2015 on NBC.

Press Release
A FIERY WESEN RISES IN PORTLAND – DANIEL ROEBUCK, GIDEON EMERY, GARCELLE BEAUVAIS AND ALEXIS DENISOF GUEST STAR – When an arson case looks to have Wesen origins, Nick (David Giuntoli) find himself reluctantly having to ask an old foe for help. Elsewhere, Viktor (guest star Alexis Denisof) teaches Adalind (Claire Coffee) the effectiveness of well-played diplomacy. Meanwhile, Juliette (Bitsie Tulloch) finds herself in a confrontation sooner than expected. Russell Hornsby, Silas Weir Mitchell, Sasha Roiz, Reggie Lee and Bree Turner also star.

Wesen

 * Blutbad
 * Fuchsbau
 * Half-Zauberbiest
 * Hexenbiest
 * Bauerschwein
 * Skalenzahne
 * Excandesco

Production Notes

 * This episode began filming on December 4, 2014.

Continuity

 * The episode began soon after ended.