A+X#1(2012)

In March 1943, Captain America and Bucky Barnes are assigned a covert mission in Nazi-occupied France after Allied intelligence discovers a massive excavation near Lyon. Rather than searching for an artifact, the Nazis are secretly burying one. According to military intelligence, the operation, known as "Contingency X," is being directed by Atticus Trask, whose objective is to conceal a devastating weapon underground so it can be unearthed and activated years in the future. Although details are scarce, Captain America is warned to expect advanced robotic technology unlike anything encountered on the battlefield. After infiltrating the heavily guarded site, Captain America and Bucky discover that the excavation contains not only numerous robotic sentries but also a colossal Sentinel being entombed beneath the earth. While they debate how to destroy such an enormous machine with the limited explosives at their disposal, their plans are abruptly interrupted by the arrival of Cable, a mysterious warrior from the future pursuing Atticus Trask across time. Forced to abandon any hope of remaining unnoticed, the three heroes join forces against the Nazi troops and their mechanical defenses. As the battle rages, Cable reveals that Trask has repeatedly manipulated history in an effort to escape him. Captain America initially questions the stranger's claims, but his skepticism fades when Cable demonstrates intimate knowledge of Steve Rogers' true identity. Meanwhile, Trask reaches the dormant Sentinel and activates it by inserting a specialized data card programmed to identify Cable as its primary target. The towering machine immediately comes online and launches a lethal assault against the time traveler. Captain America throws himself into the Sentinel's line of fire to protect Cable, explaining that while he keeps an enemy occupied, Bucky is free to strike where it matters most. Taking advantage of the distraction, Bucky climbs onto the Sentinel and drops an explosive charge directly into its open mouth, destroying the giant robot from within before it can carry out its mission. With his ultimate weapon eliminated, Trask attempts to flee by initiating another temporal jump, but Captain America intercepts him with a well-placed throw of his shield before he can escape. Later, as the remaining evidence of Contingency X—including the Sentinel punch cards—is destroyed, Cable explains that although this threat has been erased, he cannot reveal anything else about the future. Captain America wryly observes that Cable has already disclosed one important fact simply by speaking English instead of German. Taking Trask into custody, Cable departs through time, leaving Captain America and Bucky to continue the war, while Bucky jokingly remarks that he hopes to have a mechanical arm like Cable's someday.