The pesky pranksters this time are Beastly Besties Priya and Cosy and Cheeky Pranksters Joe and Will, who team up with prosthetics and make-up guru Shaune Harrison and creature creator Rob Mayor to stage the biggest and best pranks on an unsuspecting public. Taking over Manchester Museum for the day, it's all hands on deck to rig the hidden cameras and special effects required to bring our pranksters' ideas to life. But which team will impress our prank-loving panel of ranksters to win the chance to stage a mega prank on a target of their choice? It's a prank battle that's truly out if this world as Priya and Cosy's Robot v Lizard takes on Joe and Will's prehistoric prank T-R'eggs! Ranksters, the choice is yours. For the winning team, our effectors Rob and Shaune have planned the ultimate mega prank, and this time it's set in a movie-style casting room, complete with green screen, video crew, wind machine and an eccentric Hollywood director. But how will the winning pranksters' target react to the super-silly casting instructions? Will they take the challenge to become superhero Atlanticus? And how will they cope when they come face to face with archenemy Octocula and his henchmen Chill and Woe played by the Pranksters themselves?
