First Officer, also known as Executive Officer (XO), is a position synonymous with the rank of Commander and second-in-command of a starship, above the Second Officer and below only the Commanding Officer.
- Commander Kelly Grayson: The current First Officer of the Orville since September 2419, Commander Grayson requested a transfer to the ship commanded by her ex-husband, Ed Mercer.
- Lieutenant Commander Murphy of the USS Chanute was promoted in late 2419, making him eligible for a First Officer position.
- Kaylon Secondary: Second-in-command of the Kaylon, Secondary served as "First Officer" of the party which commandeered the Orville, taking Commander Grayson's chair. Secondary was deactivated along with the rest of the Kaylon by Isaac, allowing the crew to take back their ship.
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