The Australian actors took a break from filming the comic book movie in Toronto to visit a lemonade stand set up by Na'ama Uzan to raise funds to help find a cure for her brother Nadav's rare neurological illness.

Courtney tells CTV Toronto, "I heard about Na'ama's story and what she's doing for her brother Nadav. There's no act too small when you're talking about making a difference."

Nadav suffers from Angelman Syndrome, a rare congenital disorder caused by genetic malformations. Na'ama opened the lemonade stand in 2014 to raise money for the Foundation for Angelman Syndrome Therapeutics, and since then she has raised more than $25,000 (£15,625).