The Starship Troopers Chronicles

The Pluto Campaign (1x1)

Air date: Aug 30, 1999

Pluto, the so-called "9th planet" in the Sol system, was used for scientific research by SICON scientists. Arachnids appear on this planet, which prompts SICON to order the military to go and wipe them out, believing them to be a previously unknown species native to Pluto.