The digital campaign rolls out tomorrow, with a "poetry in motion" theme targeting male 20- to 40- year-olds with an interest and knowledge of cars.
Ads will link to a presenting mini films, galleries, downloads and a competition to win VIP tickets to the British Touring Car Championship.
It will also feature a 360-degree virtual tour of the Cupra workshop, allowing potential customers to zoom in and inspect the cars. Websites including Yahoo!, The Guardian, Top Gear and Football365 will house banners, media and editorial to drive traffic to the microsite.
A direct mail campaign has also been devised, breaking the week of March 5, with a CD mailer featuring the sounds of a 240PS engine. Current Leon customers can gain access to a limited access area of the microsite using a code supplied on the mailer.
Geronimo's senior account director, Claire Fox said: "The cross platform digital campaign that we developed encourages interaction with the brand on new and exciting levels".
Rob Taylor, Seat UK's national communications manager, added: "The combination of direct marketing and the cross-platform digital campaign that Geronimo has developed really conveys the Cupra's powerful, punchy, sporty attitude while encouraging the consumer to interact with us and actually experience the car in a more exciting and engaging way".
Geronimo was hired by Seat in November 2005 to capture younger drivers. The agency has also developed campaigns for Nestle Purina, Motability Operations, Tilda, Sara Lee and Direct Line.