On The Orville Season 2 Episode 8, the ship takes Isaac to his homeworld when he seems to malfunction but the true nature of his mission comes to light instead.

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When Dr. Finn and Isaac officially share news of their relationship with Marcus and Ty, the boys are overjoyed but suddenly Isaac shuts off and Dr. Finn can't figure out how to help him. Mercer gets permission to return him to Kaylon in hopes they can fix him.
The Admiral gives permission but warns Mercer that they'll be well beyond communication range. When the Orville arrives, the Kaylons give them permission and instructions to land and bring Isaac to them. They inform the Orville team that Isaac is not damaged. He was deactivated because his mission was complete.
Isaac is reactivated and confirms that he will not be returning to the ship. Dr. Finn, Marcus, and Ty are heartbroken. The ship throws him a good-bye party.
The ship remains on the planet as the Kaylons consider whether they want to join the Planetary Union. Bortus and Keyali notice some strange structures that are emitting radiation like weapons would. Mercer gets the sense that the Kaylons are stalling.
Ty runs away from the ship in hopes of seeing Isaac again. He gets lost and discovers some underground tunnels. When his absence is discovered, Dr. Finn, Bortus, and Keyali find him in the tunnels. They also discover a huge grave site of biological remains.
Mercer takes the information to confront Isaac and they find out that the Kaylons eradicated the biological beings that originally built them. Isaac's true mission on the Orville was to judge whether other biological species were worth saving when the Kaylons expanded to other worlds.
The Kaylons take over the Orville and launch their fleet to target Earth.

Episode Details

On The Orville Season 2 Episode 8, an emergency occurs when the ship explores some secrets that might be better off if they were kept hidden.

Rating: 4.8 / 5.0 (22 Votes)
The Orville
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The Orville Season 2 Episode 8 Quotes

Grayson: If you've been reading Isaac's reports, you must know a few things about us humans.
Kaylon Primary: You are primitive biological organisms.
Grayson: Maybe so. But our emotions can get pretty complicated. We tend to get attached to things... and to people.
Kaylon Primary: A cognitive defect.

Isaac: There should be no shame in the acknowledgment of one's intellectual inferiority. It is simply a statement of fact. Some beings are more intelligent than others. I am more intelligent than you.
Ty: But it's not nice.