After being sucked out of the Moon Base's airlock, Steven and the Rubies are stuck floating in the middle of space. To stay safe, Steven puts himself in a bubble and runs into one of the Rubies in the process.
Steven Universe is a coming-of-age story told from the perspective of Steven, a chubby and happy-go-lucky boy and the youngest member of an intergalactic/ethereal team of warriors called the Crystal Gems.