Andy Mientus and Roger Howarth Guest Star in 'The Flash' Tonight

Andy Mientus as the Pied Piper. Photo Credit: The CW

Broadway star Andy Mientus and General Hospital's Roger Howarth guest star in tonight's new episode of The Flash ("The Sound and the Fury"), airing at 8 p.m. ET/PT on The CW.

Dr. Wells' (Tom Cavanagh) former protégée, Hartley Rathaway (guest star Andrew Mientus), returns to seek revenge on his mentor after being affected by the particle accelerator explosion. Now able to manipulate sound waves, the brilliant Rathaway is a dangerous threat to both Wells and The Flash (Grant Gustin). Meanwhile, Iris (Candice Patton) is thrilled when she's hired by the Central City Picture News as their newest cub reporter.

Unfortunately, her editor (guest star Tom Butler) pairs her with a veteran reporter, Mason Bridge (Roger Howarth), who wants nothing to do with her. Cisco (Carlos Valdes) recalls his first day on the job at S.T.A.R. Labs when he met Hartley and Caitlin (Danielle Panabaker). Joe (Jesse L. Martin) asks Eddie (Rick Cosnett) for a favor but asks him to keep it a secret from Barry.

Watch a sneak peek of "The Sound and the Fury" below:

'The Flash' Sneak Peek: Greg Finley Guest Stars as DC Comics' Villain Girder

Greg Finley as Tony Woodward. Photo Credit: Cate Cameron/The CW

The next new episode of The Flash ("The Flash Is Born") airs Tuesday, November 18 at 8 p.m. ET/PT on The CW.

The Flash (Grant Gustin) faces a new meta-human named Tony (guest star Greg Finley, Star-Crossed, The Secret Life of the American Teenager), who can turn himself into girded steel at will. While Dr. Wells (Tom Cavanagh) and Caitlin (Danielle Panabaker) are concerned about Barry’s safety, Cisco (Carlos Valdes) comes up with a plan to take Tony down. Meanwhile, Iris' (Candice Patton) blog on The Flash gets her into trouble, and Eddie (Rick Cosnett) witnesses Tony's abilities firsthand and begins to ask questions that Joe (Jesse L. Martin) doesn't want answered. Joe asks Dr. Wells to help him solve Nora Allen's murder.

Watch a sneak peek of "The Flash is Born" below:

'The Flash' Sneak Peek; The Flash Battles The Mist on Tonight's New Episode

Grant Gustin stars as Barry Allen in The Flash.

The Flash battles The Mist, and Caitlin tells Barry about Ronnie in this week's new episode of The Flash, airing at 8 p.m. ET/PT on The CW.

As Barry (Grant Gustin) and the team at S.T.A.R. Labs work to capture Kyle Nimbus (guest star Anthony Carrigan), a.k.a. The Mist, a dangerous new meta-human with toxic gas powers, they revisit the painful night the particle accelerator exploded and killed Caitlin's (Danielle Panabaker) fiancé, Ronnie (guest star Robbie Amell).

Meanwhile, Joe (Jesse Martin) decides to finally visit Henry (John Wesley Shipp) in jail after all these years, but things take a dangerous turn when Kyle shows up looking to punish Joe for arresting him years ago. Meanwhile, Iris (Candice Patton) and Eddie (Rick Cosnett) continue to hide their relationship from Joe.

Watch a sneak peek below:

'The Flash' Premieres Tonight on The CW: The Fastest Man Alive is Born!

Grant Gustin stars as Barry Allen in The Flash.

The Flash premieres tonight at 8 p.m. ET/PT on The CW.

Barry Allen (Grant Gustin) was just 11 years old when his mother was killed in a bizarre and terrifying incident and his father (Emmy winner John Wesley Shipp) was falsely convicted of the murder. With his life changed forever by the tragedy, Barry was taken in and raised by Detective Joe West (Jesse L. Martin), the father of Barry's best friend, Iris (Candice Patton). Now, Barry has become a brilliant, driven and endearingly geeky CSI investigator, whose determination to uncover the truth about his mother's strange death leads him to follow up on every unexplained urban legend and scientific advancement that comes along.