Saturn made his first appearance at the ending of A Secret Sphere of Influence!, though it was a brief appearance at the end of the episode. He, along with the other Team Galactic Grunts, commented that Jessie, James and Meowth did a lousy job at stealing the Adamant Orb for them, and framing Nando for the crime.

Saturn later reappeared in Journey to the Unown!, along with his Bronzor. He managed to steal a cube that was under the guard of the Unown of the Solaceon Ruins and brought it with him back to the Team Galactic HQ.

Saturn appeared again in Enter Galactic!, with the cube he obtained in Solaceon Ruins, which he exposed to the meteorites in Veilstone City, transforming it into the Spear Key. Later, he and a few Galactic Grunts went to go steal the meteorites, but ended up meeting Ash and his friends for the first time. He also battles Brock and his Croagunk with his own Toxicroak, but it ends in a draw, as Team Galactic retreats and fails their mission.

He appeared in Losing Its Lustrous and Double Team Turnover!, along with Cyrus, Jupiter and Mars. They stole the Lustrous Orb and the Adamant Orb from the Celestic Town Historical Research Center.

He reappeared with Cyrus, Jupiter and Charon in Saving the World From Ruins! where he was put in charge of excavation of the Spear Pillar from Mt. Coronet.

Saturn appeared again in Gateway to Ruin!, along with Charon, where they attempted to locate the ruins of Mt. Coronet.

Saturn also appeared in the Team Galactic finale with three episodes, Unlocking the Red Chain of Events!, The Needs of the Three! and The Battle Finale of Legend!. During the final battle, his Toxicroak was defeated by Croagunk and after Cyrus passed through the portal created by Dialga and Palkia he realized that Cyrus had just been using him and the other commanders to reach his own goals and cared little for those who served him. Afterwards he was arrested along with Mars and Jupiter by Looker and, unlike Mars, knew that Team Galactic was finished.

(Source: Bulbapedia)