A billion miles from home, out of fuel and almost out of time. After 13 years traversing the Saturnian system, the Cassini spacecraft is in the throes of a fiery death, becoming part of the very planet it has been exploring. As he embarks on his final mission, a one-way trip to the heart of Saturn, celebrate the incredible achievements and discoveries of a mission that has changed the way we see the solar system. Strange new worlds with gigantic ice geysers, hidden subterranean oceans that could support life, and a new moon merging into Saturn's magnificent rings.