Jason was a Sphinxian treecat.
He was one of Nimitz and Samantha's first litter. He and his siblings (Achilles, Andromeda, and Cassandra) were the first treecat kittens ever to live with humans from birth, as well as he first kittens ever to leave the planet Sphinx. James MacGuiness named shortly after birth due to his wanderings and explorations.[1] (HH7)