Editing Jeffrey Sinclair (section)

== Role in ''Babylon 5'' ==
{{In-universe|section|date=July 2012}}

=== Character arc ===
Jeffrey Sinclair is introduced in the 1993 pilot film, ''Babylon 5: The Gathering'', which takes place roughly one year before the first-season episode "[[Midnight on the Firing Line]]".

Jeffrey Sinclair was born on the [[Mars]] Colony. During the first season of ''Babylon 5'', Sinclair states that his family had been fighter pilots "ever since the [[Battle of Britain]]" and that his father was a fighter pilot for [[EarthForce]] who participated in the last battle of the "[[Dilgar]] Invasion." Sinclair continued this family tradition by becoming a fighter pilot. The season one episode "[[By Any Means Necessary (Babylon 5)|By Any Means Necessary]]" establishes that Sinclair received [[Jesuit]] education as a young man. 

Sinclair was promoted to fighter pilot and — less than a year later&nbsp;— promoted to squadron leader. Due to his rapid rise through the ranks, it was rumored that he was on the fast track to making [[admiral]]. In the made-for-television film, ''[[Babylon 5: In the Beginning]]'', Sinclair fights during the last major battle in the [[Earth-Minbari War]]. His squadron is destroyed by the [[Minbari]] and he is captured for interrogation by the Grey Council. The Triluminary reveals that Sinclair possesses Minbari DNA and the soul of a Minbari hero who led their people to victory in a battle against the Shadows one-thousand years ago. Concluding that Minbari souls are being born into [[Human (Babylon 5)|human]] bodies, the Minbari opt to surrender despite possessing overwhelming military superiority. Once the Minbari return Sinclair to his fighter, he loses his memory of his time aboard the Minbari cruiser.

When the Babylon 5 space station was established, Sinclair was appointed as the leader by the Minbari race who were responsible for its creation. He was selected over many senior officers, including Colonel Ari Ben Zayn, all of whom had been vetoed by the Minbari.

In ''Babylon 5'' season 2, Sinclair was reassigned as ambassador to [[Minbar (planet)|Minbar]]. He was succeeded at Babylon 5 by Captain [[John Sheridan (Babylon 5)|John Sheridan]]. As ambassador, he took command of the Rangers. In 2260, Sinclair received a 900-year old letter from himself on Minbar, revealing that he was not the ''reincarnation'' of Valen, as the Grey Council believed, but in fact Valen himself. Armed with this knowledge, Sinclair took [[Babylon 4]] back with him 1,000 years to aid the Minbari in their first war against the Shadows and, in so doing, fulfilled Minbari prophecy by becoming the [[War Without End (Babylon 5 Episode)#Part Two|One Who Was]]. Sinclair uses the Triluminary to transform himself into a Minbari and fulfills the legend about Valen being "a Minbari not born of Minbari."

=== Relationships ===
Sinclair enlisted in EarthForce in 2237. While working as a flight instructor at EarthForce Academy, he met second-year cadet Catherine Sakai. This marked the beginning of a 15 year on-again off-again relationship. Sinclair proposes to Sakai during the season one finale; this episode marks Sinclair and Sakai's final regular appearances in the series.<ref>Catherine Sakai's disappearance is explored in the canon novel, ''[[To Dream in the City of Sorrows]]''.</ref>