(covers information from several alternate timelines)
In an alternate timeline created due to multiple temporal incursions by various factions in the Temporal War, Sal worked with Carmine, Vic and Alicia Travers as a resistance fighter in 1944, fighting against the occupation of the East Coast of the United States by the Nazi/Na'kuhl alliance. Sal led a resistance cell in attacking a Nazi convoy and rescuing Captain Jonathan Archer, who had been transported to this time period by a temporal agent named Daniels, from Nazi custody.
A few days later, he helped Archer interrogate a Na'kuhl named Ghrath for information, and ultimately shot Ghrath to death despite objections from Archer. During an encounter with the German occupiers later that night, Sal was shot in the back by a Nazi soldier armed with an MP40 submachine gun while attempting to flee from them. Fortunately for Sal, the damage done to the timeline was ultimately reversed by Archer. (ENT: "Storm Front")
Sal features prominently in a deleted scene from the Enterprise Season 4 DVD. While waiting for Ghrath to arrive, Sal offers Jonathan Archer a puff on a cigar he says may be "the last Cuban in the city". After Archer turns him down, Sal mentions that he'd heard rumours of German medical experiments, suggesting that the grey-skinned, red-eyed man Archer saw was the result of such an experiment. He also discusses other rumours, of "guns that shoot light instead of bullets" that turn their targets to dust, comparing the idea to a story told by Orson Welles. Archer recognizes it as Welles' infamous unscheduled reading of War of the Worlds, and Sal admits that he was one of the many people who believed the broadcast to be an actual news report of an alien invasion, and fled in panic, though he bitterly comments that with the way the war with the Germans is going, he would almost prefer a Martian invasion.