Justice comes in all sizes, and so when one five-year-old Batman -- whose secret identity is Zavi Ahmed -- spied a family in trouble, he came to the rescue.

The Mirror reports that one-year-old Iris Adamski got trapped in her grandparents' car when her grandmother accidentally locked the vehicle with the keys inside while loading her groceries. Police arrived to free Iris, but couldn't find a way to fit into the car even after they broke the rear window.

That's when Zavi, his mother Emma and his younger brother Nadeen arrived. Zavi bravely volunteered to squeeze into the car to retrieve the keys.

"That morning he decided he wanted to be dressed as Batman, I don't know why," said Mrs. Ahmed said of her elder son. "We couldn't believe it. Of all the days for him to dress up and that happens."

"We called the police and they tried everything and eventually smashed the back window, but they couldn't reach the door because the hole was quite small. We needed to get the keys from the dashboard. Then these two little boys turned up - one was dressed as Batman and the other as Superman. They had the whole outfits and were so sweet," said Iris's grandmother, Caroline Penny.

"A policeman put his jumper down on the window to protect from the glass and Batman crawled in to fetch the keys. I was so proud. He was a true superhero and I'm so grateful to him," she added.

"I always feel like a superhero but that day was special," Zavi shared.