Formula 1 drivers Bruno Senna and Jaime Alguersuari, plus three-time Indianapolis 500 winner Helio Castroneves, will make their first appearance in Felipe Massa's annual end-of-season karting event in Brazil this weekend.
The trio join regulars including Massa, Rubens Barrichello and Lucas di Grassi for the fifth International Challenge of Go-Kart Champions in Florianopolis. Michael Schumacher, who won last year, will not be appearing this time.
The event has also attracted ex-grand prix drivers Enrique Bernoldi, Christian Fittipaldi, Luciano Burti, Ricardo Zonta and Antonio Pizzonia, plus current and former IndyCar stars Tony Kanaan, Vitor Meira, Ana Beatriz, Max Wilson and Felipe Giaffone, along with Castroneves.