This time Stephen looks at how gadgets entertain us. There's a remote-controlled pet, an automatic cocktail-maker and a futuristic pool-table machine that lines up your shots for you. There's also Jeremy Clarkson, who joins Stephen in a bid to overhaul traditional pub games by replacing them with gadgets. And Stephen tries to build the world's biggest computer game.

• Richard Ayoade
• Carol Vorderman
• Derren Brown