Creatures, Great and Small - S1.E1

The Big Guy is decommissioned in favor of Quark Industries' newest creation, Rusty the Boy Robot. But when an alien Annihilator threatens to destroy New Tronic City, it's clear that Rusty is not quite ready for prime time. The Big Guy is reassembled and joins the fight along with Rusty. General Thorton orders that the temporary alliance become a permanent partnership.