David Ninness is one of the Cronulla Shark's biggest fans, despite living nowhere near Sydney's Sutherland Shire.

When the NRL club was in turmoil he volunteered to resurrect their second mascot, MC Hammerhead.

But before he could help cheer his team to grand final glory, he'd need to learn to dodge ruthless teenagers.

Step inside the head of the NRL's scariest mascot.