"And, it's a New Zealand play as well."
The Bungling Burglars is the story of three professional burglars, Mac, McNugget and Fish Fingers, who are "absolutely hopeless".
They hatch a plan to steal all the children's teddy bears from the local hospital, only to encounter a trio of beastly nurses - named Sisters Pustule, Pimple and Blister - and be chased by a group of myopic children.
"It's got humour and silliness, some great acting by the kids and a lesson for everyone at the end," said Mr Mabey.
"And it's got a dog who sings."
While working with such a young cast had its challenges, Mr Mabey said he found it rewarding teaching his pint-sized thespians all the tricks of the theatre trade.
Through being involved in the show, he said, the children had learnt all the important dramatic techniques, such as voice projection, body movement, using the stage, and how to physically embody a character.
"For example, we've got a couple of little 8-year-old girls, and they're playing 80-year-old grandparents," he said.
"I always tell them, 'I don't want to see any of you on stage. I want to see your characters.
"And I've had to teach them not to break the fourth wall - even when they've got dad sitting in the audience."
He said the kids had also learnt some of the theatre "etiquette", including going through the audition process, how to behave backstage and the importance of making a commitment to a show.
The Bungling Burglars runs from July 20 to 26 at Harlequin Theatre.