Jag, short for Jaguar, was orphaned when her environmentalist parents died in the jungle saving animals' lives. Although she was put into a care home, she ran away two years to live on the streets where she was adopted into a street gang who have now become her family. Danny, the trickster and street magician and Tiger, whose animal instincts run close to the surface, and a few others are all animal activists at heart. Although they go one night to an animal sanctuary in the country to tag the walls with graffiti, Jag gets caught in an enclosure. However, it ends up for the best as the keeper takes a shine to her and offers a part time job when she hears Jag's affinity with the Jaguar spirit.

With Jag working at the sanctuary, her gang start spending more time there to see the great Cat Man Do perform his animal magic – until one day when a tiger is let out its cage. And that is only the beginning as a villainous Cat Man begins to stalk the streets with two pet panthers out for blood, seemingly appearing and disappearing at will. With newspapers reporting maulings and deaths and Sergeant Dickins not sure what's going on, the kids are intrigued by the reports. After witnessing an attack, the kids get sucked into this mysterious Cat Man's idea of a theatrical villain performance – but even if they have animal instincts and spirits with them and even if the big cats are swaying to their side, should they run before they too turn prey?