explosives expert. Angelle Brooks -- Maxine De La Cruz (Seasons 3-4, recurring seasons 1-2), Vallery's best friend. Shaun Baker -- Quick Williams, a former boxer. Dustin Nguyen -- Johnny Loh (Seasons 3-4, recurring seasons 1-2), a karate master and stuntman. Leah Lail -- Kay Simmons, a computer expert. Gerry Anderson -- Relic