Following "The Flash's" return from its winter hiatus, the show will re-introduce a major big bad: the Reverse-Flash. As revealed in the CW's description of the appropriately-titled "The Reverse-Flash Returns," Matthew Letscher will reprise his role as Eobard Thawne. The circumstances of the villain's return remain unclear, especially considering that he met a pretty decisive end in the show's season one finale. The episode will also feature the return of Amanda Pays as Mercury Labs' Christina McGee, and it will feature more bonding between Iris and Wally West.

"The Reverse-Flash Returns" - (8:00-9:00 p.m. ET) (TV-PG, LV) (HDTV)

HE'S BACK... - When Cisco (Carlos Valdes) gets a vibe of Eobard Thawne (guest star Matthew Letscher), Barry (Grant Gustin) and the team don't believe it. But, after an attack at Mercury Labs, Christina McGee (guest star Amanda Pays) confirms that the Reverse Flash is back. Meanwhile, Iris (Candice Patton) and Francine (guest star Vanessa A. Williams) share a nice moment that brings Iris closer to her brother, Wally (Keiynan Lonsdale). Michael Allowitz directed the episode written by Aaron Helbing & Todd Helbing (#211). Original airdate 1/26/2016.

Starring Grant Gustin, Jesse L. Martin and Carlos Valdes, "The Flash" returns to The CW at 8 pm EST on January 19. "The Reverse-Flash Returns" will air on January 26.