This penultimate episode sees reigning champions Apollo mount their defence of the title. They face stiff competition from Ms Nightshade, Coyote, Rusty, Crackers'N'Smash, Meggamouse, Trolley Rage and second-place finalist from last series Carbide. They must dodge the arena hazards and the menacing new twist as house robots are being unleashed to attack competitors and inflict maximum damage. Let battle commence!

• Dara Ó Briain
• Angela Scanlon
• Jonathan Pearce