He might be the fastest man on Earth, but he's certainly not the fairest.

Latest images from the set of the hit CW series reveal that The Flash will team up with Green Arrow and Firestorm to take on his nemesis, Reverse Flash.

The scenes show an intense stand-off as an unmasked Grant Gustin is flanked by his fellow superheroes, played by real life cousins Stephen and Robbie Amell.

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Three on one: Latest set images from The Flash reveal he teams up with Green Arrow and Firestorm to take on Reverse Flash

At the far end of the warehouse is Tom Cavanagh as Reverse Flash, who fans only recently discovered was the real identity of The Flash's supposed mentor and friend Dr Harrison Wells.

In the show, Gustin's character has only just begun to suspect there may be something fishy about the S. T. A. R. labs head,and this seems to be the moment - possibly in the the finale episode - that Cavanagh's character reveals his true identity to the hero.

He must be a formidable baddie if he needs three heroes - or four if you count Firestorm as a pair, since he is a fusion of two individual people.

Man in the mirror: Tom Cavanagh plays Reverse Flash, who was recently revealed to be The Flash's supposed mentor Dr Harrison Wells

In the dark: Grant Gustin's character doesn't yet know in the show who Reverse Flash really is

Back again: Fellow hero Green Arrow, played by Stephen Amell, will make yet another crossover into his DC counterpart's series

While Stephen Amell AKA Oliver Queen has crossed over from his show Arrow before, it is the first time we've seen him here with his real life cousin Robbie Amell, who plays the fire wielding, body-sharing Ronnie Raymond.

Wearing a mirror image of the Flash's iconic red costume right down the flipped insignia, this looks like the moment Reverse Flash reveals to Gustin's Barry Allen what the fans already know - that he was the one who killed his mother when he traveled back in time to attempt to murder Allen when he was a child, to prevent him becoming his superhero rival in the future.

Viewers have known that Harrison Wells has been harbouring secrets from episode one when it is revealed he only pretends to be paralyzed.

Family matter: It is the first time Stephen Amell will appear in The Flash with his real life cousin Robbie, who plays Firestorm

Faker: Tom Cavanagh's character has been pretending to be paralyzed from the first episode, but he has far bigger secrets

But the extend of his deception only came to light in the recent episode 15 when he admits he is only mentoring The Flash so he can utilize his powers to return to his own timeline, after getting trapped here.

Gustin recently told ComicBookResources.com that there was a major twist in store for him and his arch-nemesis that cannot be found in the comic books.

'There's a twist with Harrison Wells and the Reverse-Flash storyline that no journalist has guessed -- I've never seen it online,' he said. 'It's going to I think really surprise everyone. And it's an original twist to the character that doesn't mess up the mythology.'

Vendetta: The set shots appear to be from the season finale, when the Flash may eventually learn the reverse Flash killed his mother when he was a child

Villain: Fans now know Dr Wells is only mentoring The Flash Barry Allen to utilize his powers to return to his own timeline in the future

Besides the finale, fans are also super excited about the next episode, as it sees the return of Mark Hamill as The Trickster, a villain he originally played in the 1990s TV version of The Flash.

In the episode Tricksters, The Flash recruits the original Trickster, who is serving a 20-year prison sentence, to help track down a new villain using the same name.

The first season finale of the Flash will air on May 19, but the CW have already ordered a second season.