(covers information from several alternate timelines)
Ensign Fitzpatrick was assigned to the Maquis vessel Val Jean until it stranded in the Delta Quadrant. Upon transfer to the USS Voyager, he joined the Voyager crew and held a provisional rank in the command division under command of Captain Kathryn Janeway. In 2372 he was promoted to ensign.
He was working on the aft station of the bridge when the Voyager tried to contact the "other ship", not knowing that this ship was a reflection of itself (VOY: "Parallax") and when the ship discovered a Class M planet in a red dwarf star system. (VOY: "Time and Again")
He visited the mess hall when a non-corporeal being took over the control of the ship and brought the Voyager into a nebula (VOY: "Cathexis") and when Neelix presented Tuvok his "plomeek soup à lá Neelix". (VOY: "Faces")
He visited the mess hall and was surprised by Chakotay's reaction about the dispute with Kenneth Dalby. Later that day he had a drink with a fellow crewmember in the sciences division, from which Chell took the drink when he passed the mess hall on his run through the ship. (VOY: "Learning Curve")
Fitzpatrick worked on the bridge when an away team led by Captain Janeway found the 37's and Commander Chakotay informed them that several life signs approached their location. Later he was among the crewmembers in the mess hall who chatted with the 37's. (VOY: "The 37's")
Fitzpatrick was among the Starfleet officers who took part in the bets of Tom Paris' radiogenic sweepstakes. He was present on the holodeck at Chez Sandrine's when Commander Chakotay stopped the bets. (VOY: "Meld")
When the crew was marooned on Hanon IV, Fitzpatrick was a member of the team which tried to get Kes and Neelix back to the ship. They were successful and he survived the ensuing fight against the natives and the attack of the land eel. (VOY: "Basics, Part I", "Basics, Part II")
He served on the bridge when the Voyager discovered a class 17 nebula in 2373 (VOY: "Flashback") and passed Commander Chakotay in a corridor when the Commander ordered The Doctor to prepare Kes for a transport. (VOY: "Sacred Ground")
He was also on the bridge, operating from an aft station when Captain Janeway and Tuvok were aboard the Borg cube. Later, he almost ran into Chakotay who entered the bridge. (VOY: "Scorpion, Part II")
He was working on the bridge when the Voyager encountered a Krenim patrol ship. When Annorax changed the timeline by erasing species with his Krenim weapon ship, Fitzpatrick found himself on a heavily damaged Voyager, manning the helm station. (VOY: "Year of Hell")
In 2374, Fitzpatrick was among the crewmembers in the mess hall who received a letter from home that had been transmitted from the Alpha Quadrant over the Hirogen communications network. (VOY: "Hunters")
The same year he was talking to a sciences officer in the corridor where he walked past Seven of Nine. He seemed happy about the news Voyager possibly could return back home. Later, he passed Captain Janeway and Seven of Nine in the corridor in front of Astrometrics when the two headed to the transporter room to beam aboard the USS Dauntless. (VOY: "Hope and Fear")
- "Caretaker" (Season 1)
- "Time and Again"
- "Prime Factors"
- "State of Flux"
- "Learning Curve"
- "The 37's"
- "Persistence of Vision" (Season 2)
- "Basics, Part I"
- "Sacred Ground"
- "Basics, Part II"
- "The Chute" (Season 3)
- "Favorite Son"
- "Real Life"
- "Scorpion, Part II" (Season 4)
- "The Gift"
- "Day of Honor"
- "The Raven"
- "Year of Hell"
- "Waking Moments"
- "Hope and Fear"
- "Course: Oblivion" (biomimetic copy only) (Season 5)
- "Drive" (Season 7)
His character was identified by name in the episode "Hunters". His rank varied by episode, from provisional Ensign to provisional Crewman.