Another Look At 'The Trickster' In THE FLASH Set Photos

Here's a synopsis for the 13th episode, "Nuclear Man". (Note that this isn't the ep the Trickster will debut in).

ROBBIE AMELL AND VICTOR GARBER GUEST STAR AS FIRESTORM — After Ronnie (Robbie Amell) attacks a physicist (Bill Dow), Barry (Grant Gustin) and the team realize they need to go after Caitlin’s (Danielle Panabaker) fiancé who is now a dangerous meta-human. They deduce the best way to track Ronnie is to find Dr. Martin Stein (guest star Victor Garber) who was working on a project called F.I.R.E.S.T.O.R.M. Barry struggles to balance his duties as The Flash and his relationship with Linda Park (Malese Jow), and Joe (Jesse L. Martin) enlists Cisco’s (Carlos Valdes) help to reinvestigate the murder of Nora Allen (Michelle Harrison). General Eiling (Clancy Brown) returns to Central City. Glen Winter directed the episode written by Andrew Kreisberg & Katherine Walczak.

Source: http://www.comicbookmovie.com/fansites/markcassidycbm/news/?a=114637