It was a powerful day in Sydney, N.S. as employees at several businesses donned their finest superhero attire for the fourth annual 鈥淐aleb鈥檚 Superhero Day鈥� in honour of a special little boy.

In March 2015, Caleb MacArthur died from cancer a month shy of his fourth birthday. The beloved little boy was known to dress up as his favourite superhero, Superman, while he underwent treatment at Cape Breton Regional Hospital.

Following his death, his family and the hospital created 鈥� to raise money for pediatric palliative care.

In just four years, the movement has raised more than $400,000 for children in need of critical care.

On Monday, workers at several businesses in Sydney dressed up in superhero garb in honour of Caleb.

鈥淭heir story has just broken my heart,鈥� Melanie Sampson, who dressed up as Wonder Woman at the town鈥檚 Mazda dealership, told CTV Atlantic on Monday. 鈥淚 can鈥檛 even picture 鈥� I have three children of my own 鈥� what it must have been like for them.鈥�

Sampson wasn鈥檛 the only community member taking part, either.

At the Credit Union bank in downtown Sydney, staff showed off their various superhero T-shirts.

鈥淚t鈥檚 a very special day in the community help supporting little kids who are fighting big battles,鈥� employee Mark Carabin said. 鈥淲e just thought, 鈥楲et鈥檚 dress up like superheroes and do our little part.鈥欌��

Not too far away, staff at The Cape Breton Regional Hospital Foundation, which helps run Caleb鈥檚 Courage, sold pins and T-shirts with the little boy鈥檚 image on them.

鈥淚 would venture a guess to say there are over a thousand people who are participating in this in different ways,鈥� Communications Officer Mark Inglis said. 鈥淲e know for certain that we had an order of over 500 T-shirts come in last week. We are down to a bare minimum, just a few of those T-shirts left.鈥�

Inglis said the community鈥檚 participation in 鈥淐aleb鈥檚 Superhero Day鈥� has meant a lot to Caleb鈥檚 family.

鈥淚t means the world to them to know that Caleb鈥檚 legacy is living on forever,鈥� he said. 鈥淭hey have actually created an endowment fund, which means that money is going to be used forever, for the rest of time, to help other little superheroes fighting big battles.鈥�

On Tuesday, students at local Sydney schools will have their opportunity to dress up when it鈥檚 local superhero day for them.