Saturn is one of Team Galactic's Commanders.
At Team Galactic's headquarters, he used his Toxicroak to stop Ash and his friends from saving Azelf, Uxie and Mesprit. He later arrived at Mt. Coronet along with Cyrus, Mars, Jupiter and Charon, and assisted his boss in using the Lake Trio's powers and the Orbs to summon the legendary Pokémon Dialga and Palkia. Later, when Mars tried to follow Cyrus into the rapidly closing portal to the new universe, he stopped her movement, implying that it would be of no use.
After Team Galactic's plan had been thwarted by Ash and the others, he was arrested along with Mars and Jupiter.