Hartley Sawyer as Ralph Dibney, Grant Gustin as Barry
Barry (Grant Gustin) is reunited with his old nemesis Ralphy Dibney, aka Elongated Man, in Season 4, episode 4 of “The Flash.” The CW

Two key characters will be introduced in Season 4, episode 4 of “The Flash.”

As confirmed by the synopsis and trailer for the episode, Ralph Dibney (Hartley Sawyer) and Breacher (Danny Trejo) are making their debut appearance in next week’s episode of the CW series.

According to the synopsis for the episode, Ralph, aka Elongated Man, is an old nemesis of Barry (Grant Gustin). While it’s unclear how Ralph and Barry’s rivalry started, Joe (Jesse L. Martin) reveals in the trailer that Ralph used to be a cop.

In an interview with TV Insider last September, executive producer Andrew Kreisberg revealed that there’s going to be a lot of conflict between Barry and Ralph “in terms of how to be a good guy” this season.

“Ralph is hitting on everybody all the time. He’s brash and loud and doesn’t listen,” Kreisberg described the private detective, before revealing that the new character is hiding something about how he acquired his powers of malleability. “That’s one of the big mysteries of the season,” teased the exec producer.

The name Ralph Dibny was mentioned in Season 1, episode 7 as one of the 14 people who lost their lives due to the particle accelerator explosion in the series premiere. So if that Ralph and the Ralph that will be introduced next episode are one, then it would be interesting to find out about how he came back to life.

Meanwhile, as revealed over the summer, Breacher is a feared bounty hunter from Earth-19 and the imposing father of Gypsy (Jessica Camacho). When he shows up on Earth-1, Breacher takes an immediate disliking to his daughter’s boyfriend, Cisco (Carlos Valdes).

In an interview with TV Guide earlier this month, Camacho revealed that Cisco will attempt to impress his girlfriend’s father by literally running away from him.

“That leads to this very awesome, thorough hunt for Cisco that [Breacher] is on,” Camacho said, suggesting that Cisco and Breacher will play a game of catch-me-if-you-can. “It’s definitely putting Cisco to the test as to whether he can stand up and prove himself to my [onscreen] dad.”

“The Flash” Season 4, episode 4, titled “Elongated Journey Into Night,” airs on Tuesday, Oct. 31 at 8 p.m. EDT on The CW. Watch the trailer for the episode below: