Coming from NBC’s official press release, the episode description for Plumed Serpent (Season 1, Episode 14):

“GRIMM”

“PLUMED SERPENT”

03/09/2012 (09:00PM – 10:00PM) (Friday) : NICK’S LATEST CASE THREATENS HIS RELATIONSHIP WITH JULIETTE – DANIEL BALDWIN ( “HOMICIDE” ) AND DANIELLE PANABAKER (“FRIDAY THE 13TH”) GUEST STAR — While investigating an arson-related homicide with Hank (Russell Hornsby), Nick (David Giuntoli) finds himself in the heated world of Portland fire-dancing where he meets a woman (guest star Danielle Panabaker) who might just be too hot to handle. With Monroe’s (Silas Weir Mitchell) help, Nick will have to find out if he can investigate the case without getting himself or those close to him burned. Bitsie Tulloch, Sasha Roiz and Reggie Lee also star.

So it seems both ‘Girls Against Boys’ and ‘Plumed Serpent’ will have their debut on March 9, 2012! We’ll keep you informed about previews and episode stills.

Danielle Panabaker will guest star in NBC’s new series, “Grimm”. She’s currently filming her episode.

Danielle spilled the beans yesterday, January 12th:

@dpanabaker Headed to work on my first day at Grimm!

According to some spoiler scoop by EOnline.com, Danielle will, most likely, be playing Ariel: a beautiful and tempting fire dancer who is a Daemonfeuer (a dragon-like creature).

“Grimm” is a new drama series inspired by the classic Grimm’s Fairy Tales.Portland homicide Detective Nick Burkhardt (David Giuntoli, “Turn The Beat Around”) discovers he is descended from an elite line of criminal profilers known as “Grimms,” charged with keeping balance between humanity and the mythological creatures of the world.