Flash Season 1 is about to get more exciting with its all-new episode 13 this Tuesday night. As the investigation on what really happened to Ronnie comes to a close, the S.T.A.R. Labs team, along with Barry Allen, will discover that Ronnie and Dr. Stein have become one. However, whether their combined alter-ego Firestorms a friend or foe is yet to be known. Is there a way to separate this two from their combined meta-human self? Find out by tuning in on The CW at 8/7c.

Note: The following paragraphs contain spoilers on the all-new episode of CW's "The Flash."

Last week, Cisco has finally realised that Ronnie and Dr. Stein have been fused as a result of the S.T.A.R. Labs disaster a few months back. Their combined persona Firestorm is a bit mysterious but if the show is going to follow the comics storyline, then Firestorm could split back into two at will. On the other hand, since Dr. Wells is enjoying the scenario, he may be one to keep the Firestorm going and use the meta-human to his own advantage. Watch Flash season 1 episode 13 stream using the free live stream link below.

Interestingly, someone is joining the show soon. "Walking Dead" alum Emily Kinney has reportedly been cast to play The Atom, which was typically a male nemesis in the comics storyline. Kinney is set to appear in the 18th episode of the series in time for Ray Palmer and Felicity's visit at Central City. Her human identity is Brie Larvan, who is described as "a narcissistic tech wizard wreaking havoc in Central City." Looks like Flash is getting more action before the show wraps its first season up. Watch Flash season 1 episode 13 stream using the free stream link at the end of this post.

The official synopsis of Flash season 1 episode 13 reads: "After Ronnie attacks a physicist, Barry and the team realize they need to go after Caitlin's fiancé who is now a dangerous meta-human. They deduce the best way to track Ronnie is to find Dr. Martin Stein 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, and Joe enlists Cisco's help to reinvestigate the murder of Nora Allen. General Eiling returns to Central City."

Flash stars Grant Gustin, Danielle Panabaker, Carlos Valdes, Jesse L. Martin and Clancy Brown. Guest starring in this week's episode are Robbie Amell, Bill Dow, Victor Garber, Malese Jow and Michelle Harrison.

"The Nuclear Man" is set to air this Tuesday at 8/7c on The CW. Watch Flash season 1 episode 13 online using this free live stream link here.