• The cast of 'Arrow' and 'Flash' attend a special screening for the CW's 'Arrow' And 'The Flash' at Crest Theatre on November 22, 2014 in Westwood, California.

The cast of 'Arrow' and 'Flash' attend a special screening for the CW's 'Arrow' And 'The Flash' at Crest Theatre on November 22, 2014 in Westwood, California. (Photo : Getty Images/ Joshua Blanchard)

The Flash and Supergirl are set to test who is faster amidst the alien invasion. The new sneak peek for the upcoming episode reveals that the Dominators can control minds. Fans can watch "The Flash" Season 3, episode 8 online via live stream, here.

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Warning: This article contains spoilers from "The Flash" Season 3 episodes. Read to know more.

"The Flash" Season 3, episode 8 spoilers roundup

The sneak peek shows the heroes in Central City after it is attacked by the Dominators. The war against the Dominators is going to heat up. During the sneak peek, we find out that the aliens have mind-control abilities.

The crossover event continues as Barry asks the Green Arrow to help him protect the city and stop the Dominators.

However, they realize it is not easy to stop this new threat and they call Legends of Tomorrow and Supergirl for assistance.

They all assemble in Central City and formulate a plan to beat the aliens, however, a shocking surprise awaits them which is related to the Flashpoint. Now, they don't know who to trust.

"A superhero crossover event continues with aliens attacking Central City and Barry asking the Green Arrow for help to stop them. But they soon realize the battle is bigger than they thought, so they track down the Legends of Tomorrow and Supergirl to help. Once all of the super friends are assembled, they come up with a plan to attack but a shocking secret related to Flashpoint is revealed and suddenly no one is sure who they can trust," reads the synopsis.

Watch "The Flash" Season 3, episode 8 new trailer

Credit: YouTube/Television Promos

Stay tuned for "The Flash" Season 3, episode 9 promo and spoilers. Share your views and thoughts in the section below.

"The Flash" airs Tuesdays on CW at 8 p.m. ET.