Reminder on Star Trek officer ranks in order: Ensign, Lieutenant Junior Grade, Lieutenant, Lieutenant Commander, Commander, Captain, Rear Admiral, Vice Admiral, Fleet Admiral, Star Admiral.
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Star Trek - Voyager
In early 2372 AD, energy beings from a nebula displaced the beloved Chakotay's consciousness. The Doctor pronounced Chakotay brain dead. Alternate timeline diverging here: Chakotay's spirit doesn't roam the ship and get reunited with his body eventually because that's just silly. The Doctor was right: brain dead is dead. (also: Seven of Nine has just joined the crew, and Kes is staying)
You were originally in Starfleet as an engineer, but left to join the Maquis. Captain Janeway has chosen you to be her new 'Number One', though she usually just calls you by your name.
Janeway has called you to her ready room to debrief you on your promotion. When you woke up this morning, you were a Lieutenant. Now that's changing.
Captain Janeway:Ah. Hour. Today's your lucky day.She gestures to the chair in front of her desk.Have a seat, Commander.