The agency was handed the £8 million business after a four-way pitch against The Brooklyn Brothers, BETC London and M&C Saatchi. Oystercatchers ran the pitch, with support from TM Management.
Campaign first reported news of the pitch in May. Dare was the incumbent, having inherited the client when it merged with MCBD in 2011, but declined to repitch.
Amy Holdsworth, the marketing director for the UK and Ireland at Tata Global Beverages, which owns Tetley, said: "Creature’s passion, energy and fresh creative thinking were outstanding."
Dan Shute, a managing partner at Creature, said: "This is a brand that demands great advertising, and we’re stupidly excited about rising to the challenge of delivering it and showing what a sleeping giant the Tea Folk concept is. Let’s do this."