The Toclafane were the humans from the year 100,000,000,000,000. As the end of the universe approached, man-kind had looked for a way to live beyond the collapse of reality, and they found that they could do so by installing themselves into machines.
The Toclafane resemble black, metal spheres that can levitate and fly through space. They have spikes and knives that extend from their body and posses blasters that can disintergrate a human being. They traveled back in time to the 21st century with the help of the Master, to escape the end of the universe.