• Tom Cavanagh and Grant Gustin attend the 'The Flash' Special Video Presentation and Q&A during Comic-Con International 2016 at San Diego Convention Center on July 23, 2016 in San Diego, California.

Tom Cavanagh and Grant Gustin attend the 'The Flash' Special Video Presentation and Q&A during Comic-Con International 2016 at San Diego Convention Center on July 23, 2016 in San Diego, California. (Photo : Getty Images/Matt Winkelmeyer)

Viewers will learn about a dangerous secret in "The Flash" Season 3 episode 5 titled "The Wrath of Savitar." This secret will threated the happiness of Barry Allen/The Flash (Grant Gustin) and Iris West (Candice Patton).

Wally West (Keiynan Lonsdale) will star to have visions of Savitar (Andre Tricoteux) while training with Barry. However, Wally will not reveal this to the team.

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Barry headed to Earth Three to get advice from Jay Garrick (John Wesley Shipp) on how to stop Savitar in "The Flash" Season 3 episode 9 titled "The Present." In the episode, which aired on Dec. 6, 2016, Wally told Barry that he had been training with H.R. Wells (Tom Cavanagh).

Cisco Ramon (Carlos Valdes) also faced Christmas without Dante Ramon (Nicholas Gonzalez) in "The Present." This reopened old wounds.

Gustin, Patton, Lonsdale, Tricoteux, Cavanagh and Valdes will be in "The Wrath of Savitar." They will be joined by Danielle Panabaker as Caitlin Snow, Jesse L. Martin as Joe West and Vanessa Williams as Francine West.

The voice of Savitar was provided by Tobin Bell, who is set to star with Tom Sizemore and Kiowa Gordon in an upcoming horror film written by John Corcoran and Ram Getz titled "Whisper of the Wolves." Bell played Yo Ling in "Days of Our Lives" before voicing Savitar.

"The Wrath of Savitar" was directed by Alexandra La Roche. The episode will air on March 7, Tuesday, at 8 p.m. on The CW.

Meanwhile, Gustin is set to appear as The Flash for the third time in "Supergirl" after appearing in it in two episodes in 2016. The crossover will take place in "Supergirl" Season episode 16 titled "Star-Crossed," which will air on March 20.

Have a glimpse of Gustin and Melissa Benoist in "The Flash" and "Supergirl" musical crossover here: