Sivos is the home planet of the Sivians. The north of the planet is covered with a radioactive wasteland.
Fleeing from the Confederacy, Leo Fitz and Enoch arrived on the planet of Sivos. Using an Iriscope, Fitz changed the color of his eyes so he could claim to be a Sivian, coming from the north of the planet, which was actually a radioactive wasteland where barely anything could survive. While on Sivos, Fitz managed to get himself recruited by Viro, the owner of the Lazy Comet, and left Sivos in the spacecraft after hiding Enoch in it as well.