This planet rocks!

"Rover and Speck couldn't be more different. Rover is organized, careful, and on a mission to explore the far reaches of the galaxy. Speck is impulsive, excitable, and stranded alone on a rocky planet. But these two rovers have to team up when Rover crash lands and helps Speck recharge his battery. Together, they can explore the planet and gather tons of cool scientific data! That is, if the strange rock creatures chasing them don't get to them first"--Provided by publisher.