THE FLASH Season 1, Episode 19 Synopsis:"Who Is Harrison Wells?"

The CW has released a synopsis for the April 21 episode of The Flash, titled “Who Is Harrison Wells?”

The episode will guest-star Paul Blackthorne and Katie Cassidy from Arrow in their roles as Captain Quentin Lance and his daughter Laurel.

You can check out the official synopsis below.

JOE AND CISCO TRAVEL TO STARLING CITY FOR ANSWERS ABOUT DR. WELLS — Joe (Jesse L. Martin) and Cisco (Carlos Valdes) head to Starling City to continue their investigation of Dr. Wells (Tom Cavanagh). While in town, the duo enlists the help of Captain Lance (guest star Paul Blackthorne), and Cisco meets the Black Canary (guest star Katie Cassidy), who asks him for a favor. Meanwhile, back in Central City, Barry (Grant Gustin) races to catch a meta-human named Hannibal Bates (guest star Martin Novotny) who can transform himself into every person he touches – which includes Eddie (Rick Cosnett), Iris (Candice Patton), Caitlin (Danielle Panabaker) and even The Flash. Wendey Stanzler directed the episode written by Ray Utarnachitt & Cortney Norris (#119). Original airdate 4/21/2015.

New Promo Stills For ARROW Season 3, Episode 18: "Public Enemy"

Detective Quentin Lance is in trouble or is he? And a shocked Felicity greets her mother when Ray is in the hospital. The CW has released promotional photos for episode 3×18 of Arrow, titled “Public Enemy,” which airs Wednesday, April 1 at 8/7c. 

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DONNA SMOAK RETURNS — During an attack on the mayor’s office, Ray (Brandon Routh) is critically injured. Felicity (Emily Bett Rickards) is pleasantly surprised when her mother, Donna Smoak (guest star Charlotte Ross), shows up at the hospital to offer her support. With the SCPD out in full force looking for the assailant, Oliver (Stephen Amell) and his team work hard to stay one step ahead of the police to find the man responsible. However, things come to a head when Ra’s al Ghul (guest star Matt Nable) kidnaps Captain Lance (Paul Blackthorne). Dwight Little directed the episode written by Marc Guggenheim & Wendy Mericle (#318). Original airdate 4/1/2015.

Arrow airs Wednesdays at 8/7c on The CW.