Alien species (Certificate of Destruction)
From Tardis Wiki, the free Doctor Who reference
A spider-like alien species were in a competition with the De'htrexi that took place on Earth. The species controlled cats while the De'htrexi controlled dogs. When the De'htrexi got out of hand and began controlling humans as well, the other species enlisted the Sixth Doctor's help to defeat the De'htrexi. (PROSE: Certificate of Destruction)
