Harrison Wells Reverse Flash secret out in The Flash episode 15
Harrison Wells' Reverse Flash secret will be out in The Flash episode 15CW

The official synopsis for The Flash episode 15 is out, where Liam Mcintyre guest stars as the Weather Wizard.

The all new episode is titled, Out Of Time, where Cisco realises that Harrison Wells is hiding something from the team.

The description reads as follows:

Mark Mardon aka The Weather Wizard (guest star Liam McIntyre) appears in Central City intent on avenging his brother Clyde's death, and sets his sights on Joe (Jesse L. Martin), who shot Clyde. When Mardon attacks Joe and Barry (Grant Gustin), Barry is able to super-speed them to safety but Mardon gets away. Barry warns Joe not to go after a meta-human alone but Joe doesn't listen and ends up in grave danger. Meanwhile, Cisco (Carlos Valdes) looks into the night the team captured the Reverse Flash and realizes something doesn't add up and begins to wonder whether Joe was right about Dr. Wells (Tom Cavanagh). Barry and Linda (guest star Malese Jow) end up on an awkward double date with Eddie (Rick Cosnett) and Iris (Candice Patton). Thor Freudenthal directed the episode written by Todd Helbing & Aaron Helbing

Based on the network's promo video, the new episode has some big moments coming up. Dr Wells' character is at least partially revealed, and Cisco faces a disturbing reality.

"You have shown me what it's like to have a son," Dr Wells tells Barry Allen in the promo. This conversation happens after Barry tells Joe to stop suspecting Wells' involvement in his mother's death.

"Dr Wells had something to with Barry's mom's murder," Cisco says in the next promo sequence.

Written in bold letters in the video are the words, "They trusted him. But they never suspected him."

Watch the promo here: