The agency will create new brand and price advertising for Comet and develop a brand communications concept that can be applied across various channels and sales activity.
The appointment follows a four-way pitch against Addiction London, Albion and Quiet Storm.
Comet called the review in October and previously worked with Saatchi and Saatchi, which has held the account since 1995 but did not repitch for the account.
Comet has previously focussed on price-led advertising and has sponsored ITV1’s game show Who Wants to be a Millionaire?, hosted by Chris Tarrant.
In January, Comet appointed Jam, i-level’s social media unit, to handle its social media account.
The chain saw a 3.9% all in sales over the 10 weeks to January 8.