| Conferring with Martin Stein, he launched an attack on a transport containing an amulet that was meant to be traded for a serum that would allow the creation of Nazi super soldiers | Biography Rex joined the , a secret government organization created to combat the during on behalf of the |
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| Rex eventually rose to become the group's leader | He also encountered , and fought the rogue time traveler several times |
The speedster then fled, and the fatally injured Rex was discovered by Amaya.
4| Current timeline Rex and the JSA discuss the Legends | Unfortunately, both Vixen and were captured |
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| With his dying breath, Rex told her that his attacker was a , before dying in her arms, much to Amaya's heartbreak | After capturing them Rex observed them arguing in their prison cell via a camera, but as surprised when his team told him they knew his name |
While the Legends were skeptical to believe him, Rex tried to stress the grave consequences of traveling through time again, but suddenly faded out of existence much to the Legends' confusion.
14| He was then contacted by the president for a mission in Paris after Baron Kreiger was located | Prior to 1942, Rex recruited into the team |
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| The Reverse-Flash attempted to stop Hourman and succeeded in killing the Legends but Hourman was successfully able to venture through time | However, after Martin turned the right of leadership over to Sara Lance, he agreed to save them |
After a successful mission, Rex returned to the JSA headquarters with the but was attacked by the , who phased his vibrating hand through Rex's chest to prevent him from completing his warning to the Legends.
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