Answer
Heikki Kovalainen replaced Kimi Räikkönen for the final two races of the 2013 Formula One season at the Lotus F1 Team. Räikkönen had back surgery after the Japanese Grand Prix, and Kovalainen was brought in as a substitute. Kovalainen had previously raced for Lotus in 2010 and 2011, and he had also competed for McLaren and Caterham in Formula One.