The CW's hit DC superhero series "The Flash" is currently on a hiatus, but the fans have more reasons to tune in to its comeback next week as season 4 welcomes back an exciting villain. Episode 17, titled "Null and Annoyed," will feature the return of guest star Danny Trejo, who portrays one of the season's baddies, Breacher. Likewise, the upcoming episode will see the team-up of Barry Allen (Grant Gustin) and Ralph Dibny (guest star Hartley Sawyer), although one of the duo will tick off his partner due to being too complacent.

"The Flash" season 4 episode 17 will be centered on the hunt for the remaining bus metas in Central City. Per the official synopsis, Team Flash has no idea how powerful and dangerous the lurking meta humans are out there, so it is probably a good idea to send in not just one, but two members of the squad to defend the city. With this, Barry will have the aid of Ralph, now popularly known as the Elongated Man.

In one of the episode 17 promos, the Scarlet Speedster is shown to be dealing with a female bus meta that has the ability to manipulate gravitational force. This meta uses her power to steal from jewelry stores, making all the valuable items freely float in mid-air. Unfortunately for Barry, his life will be put in danger as the new menace tries to drop him to his death.

As the Flash teams up with the Elongated Man to capture the bus metas that are threatening the public, he will notice something off in his partner's attitude towards becoming a hero. Tension will brew as Barry will lose his cool due to Ralph's lack of concern for the people. For Ralph, gaining the trust and love of the people is more important than saving them from danger.

"The Flash" season 4 episode 17 sees Breacher search for a special person to perform his latest plan. The viewers last saw Breacher with his daughter Gypsy (Jessica Camacho), but for the time being, the villain will need the help of Cisco (Carlos Valdes). Of course, the former will not easily follow Breacher, knowing his twisted background. Of course, Team Flash will also have the mind The Thinker/Clifford DeVoe (Neil Sandilands), who is on his own quest to collect all the powers of the remaining bus metas.

"The Flash" season 4 episode 17 will air on April 10 at 8 p.m. EST on the CW.