Michael Keaton asked The Flash director to take photos of him in Batsuit to show his grandson

Michael Keaton was overcome with emotion on the set of The Flash and asked for a picture of himself dressed in the iconic Batman suit - nearly thirty years since he last donned the cape.

This revelation came in a recent interview with the director of the movie, Andy Muschietti, in which he opened up about Keaton's experiences coming back to play the Caped Crusader.

Keaton, 71, previously took on the role of the Dark Knight in the 1989 film Batman, where he faced off against Jack Nicholson's Joker.

Three years later, he was back again to battle the Penguin (Danny Devito) and Catwoman (Michelle Pfeiffer) in the sequel Batman Returns.

In the thirty years since Keaton took on the iconic role, it has been played to varying degrees of acclaim by Val Kilmer, George Clooney, Christian Bale, Ben Affleck and, most recently, Robert Pattinson.

Warner Bros

Reflecting on Keaton's return, Muschietti said: "When [Keaton] arrived to the set, the Batcave was already finished and it was lit and everything.

"He stayed like this [eyes wide] for a while. I didn’t want to interrupt him. I just wanted for him to take it in. Who knows what was going on there? But something was going on there."

Keaton took his excitement one step further and asked the director to take a snap of him back in the suit.

Muschietti explained: "It was funny because at one point during the scene where we shot him in the full suit, he was like, ‘Can you take a picture? It’s for my grandson'.

"It was one of those moments where he really showed something was inside that was very emotional."

Warner Bros

The Flash was screened in its entirety at CinemaCon by Warner Brothers, where Keaton received unanimous praise.

Even catching a glimpse of Keaton in the trailer was enough to get fans excited as he brought back his iconic line from the 1989 movie: "You wanna get nuts? Let's get nuts."

Talking about signing onto the film in 2022, Keaton said: "It seemed like fun.

"I was curious what it would be like after this many years. Not so much me doing it - obviously, some of that - but I was just curious about it, weirdly, socially.

"This whole thing is gigantic. They have their entirely own world. So, I like to look at it as an outsider, thinking 'Holy moly!'

"The writing was actually really good. So I thought, why not? It’s cool to drop in and I’m curious to see if I can pull it off."

The Flash will be released in cinemas on 16 June.