The fourth episode of 'The Flash' premieres tonight, Tuesday, Oct. 28 at 8 pm on The CW Network featuring two new characters, Captain Cold and 'Arrow' character Felicity Smoak.

In Episode 3, "Things You Can't Outrun," S.T.A.R. and Flash worked hand-in-hand to capture Kyle Nimbus (guest star Anthony Carrigan) who doubles as The Mist, another meta-human villain who has the ability to dissolve himself and transform into deadly gas which can consume his enemies. The Flash was able to prevent The Mist from poisoning Joe (Jesse Martin). Meanwhile, a flashback too the viewer into the tragic night that the particle accelerator exploded and unfortunately killed Caitlin's (Danielle Panabaker) fiancé, Ronnie.

Tonight's episode, entitled "Going Rogue" introduces a new villain to the scene, the conniving Captain Cold played by 'Prison Break' actor Wentworth Miller. Beyond that, fans will see two DC shows intertwine as Felicity Smoak (Emily Bett Richards) from 'Arrow' appears.

The Episode 4 synopsis reveals that Barry will stop a bank robbery, but the culprits escape after shooting a guard. The culprit and the leader of the thieves, Leonard Snart (Wentworth Miller) is positively identified by Barry as Detective Joe (Jesse L. Martin) shows him a book of suspects.

Snart attempts to steal the Kahndaq Dynasty Diamond, and later acquires a weapon invented by Cisco (Carlos Valdes) that can kill The Flash- the "Cold Gun," transforming him into Captain Cold.

Dr. Wells (Tom Cavanagh) is angered when he discovered that Cisco made the weapon without them knowing and now it's disappeared.

Meanwhile, Felicity Smoak and Barry Allen will go on a very awkward double date with Iris (Candice Patton) and Detective Eddie (Rick Cosnett).

Felicity will visit Barry after discovering his powers from the Green Arrow (Stepehen Amell).

Cosnett stated in an interview with E! Online, "I can tease that there's going to be a double-date happening with Felicity when she comes over to Central City [in episode 4 of The Flash]."

"That interaction is quite hilarious. That's the great thing about The Flash, that it does have very comedic elements to it. We keep it light while still keeping it epic and real and dark. So that's going to be a great episode to see Felicity and how we all interact with her," he added.

Watch the Episode 4 "Going Rogue" trailer of 'The Flash' below: