The Flash season 1, episode 13, “The Nuclear Man,” airs tonight, as the S.T.A.R. Labs team investigates what happened to Ronnie and Dr. Stein.

Previously

Geeky, perpetually late CSI Barry Allen was struck by a bolt of lightning that was the result of a freak storm caused by a malfunctioning particle accelerator. After a nine-month coma, Barry awoke to find himself endowed with super speed.

Working alongside scientists Cisco Ramon, Caitlin Snow, and Harrison Wells as well as his surrogate father, Detective Joe West, Barry uses his new-found powers to save people and help contain other meta-humans who also gained powers in the explosion as well as to free his father from a false murder conviction.

Read our recap for The Flash season 1, episode 12, “Crazy for You,” here.

Watch a promo

‘The Flash’ season 1, episode 13, ‘The Nuclear Man,’ synopsis

If that promo has whet your appetite, make sure to read the official synopsis for the 13th episode of the season:

“ROBBIE AMELL AND VICTOR GARBER GUEST STAR AS FIRESTORM — After Ronnie (guest star Robbie Amell) attacks a physicist (guest star 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 (guest star Malese Jow), and Joe (Jesse L. Martin) enlists Cisco’s (Carlos Valdes) help to reinvestigate the murder of Nora Allen (guest star Michelle Harrison). General Eiling (Clancy Brown) returns to Central City. Glen Winter directed the episode written by Andrew Kreisberg & Katherine Walczak (#113).”

If you need more goodies to tide you over, we have promotional stills from the episode as well:

Producer’s preview

Watch ‘The Flash’ season 1 online

If you’re unable to catch The Flash season 1, episode 13, “The Nuclear Man,” live tonight, you’re not out of luck. If you want to watch online, The CW posts new episodes of the show to its site the day after they air.

You can also find new episodes within 24 hours on iTunes and Amazon. The last five episodes to air on The CW are available eight days after broadcast on Hulu as well.

Will you watch ‘The Flash’ season 1, episode 13, ‘The Nuclear Man’?