After devoting its past two episodes on the battle of Barry Allen/The Flash (Grant Gustin) and his team against Grodd and his army of gorillas, tonight's episode of "The Flash" will feature the return of an enemy that may jeopardize Iris' (Candice Patton) life: Savitar, the so-called God of Speed.

While Barry and the rest of his team successfully defeated Grodd and his army of gorillas on last week's episode, this does not mean that the Scarlet Speedster's troubles and superhero antics are over. In fact, tonight's episode is likely to have the fans at the edge of their seats once more as it will feature the The Flash dealing with the return of Savitar.

To the uninitiated, Savitar is dubbed as the God of Speed who was last featured in the series' season 3 midwinter finale last December. In the said episode, it was revealed that Barry's future-self trapped the villain in eternity, and that Savitar killed Iris in the said timeline with his blade.

While Barry was told that what he witnessed in the future is just one of the infinite possibilities that can happen depending on his actions, and that the Philosopher's Stone that prompted the existence of Savitar placed in a box and thrown into the Speed Force, Savitar will be making a comeback on tonight's episode 15 titled "The Wrath of Savitar."

According to the synopsis for tonight's episode, Wally (Keiynan Lonsdale) will start having visions of Savitar while training with Barry as the Kid Flash. Despite this, though, he will keep to himself the visions he is seeing.

The synopsis also states that a dangerous secret will take a toll on Barry and Iris' happiness. While it remains unknown what this secret is, it is suspected that it may be no other than Wally's visions about Savitar.

What visions about Savitar is Wally getting? Will Savitar kill Iris at the present time instead of the future? Find out as "The Flash" season 3 episode 15 airs over The CW tonight at 8/7 C.