are small spider-like robots created by Trask Industries to withstand various forms of hazardous environments and attacks as well as adapt quickly to damage taken. Additionally, a similarly named government agency called Sentinel Services appears throughout the series. Film The Sentinels were originally meant to appear in X-Men (2000). In an early draft written by Andrew Kevin Walker and turned in during June 1994, Henry Gyrich and Bolivar Trask use three 8 feet (2.4 m) tall Sentinels to attack the X-Men. Following several rewrites and new scripts, the Sentinels were eventually dropped from the film. A Sentinel appears in X-Men: The Last Stand (2006) as a Danger Room simulation. Two variations of the Sentinels appear in X-Men: Days of Future Past (2014). The prototype Mark I Sentinels were designed by Legacy Effects with Digital Domain building digital models based on a full-scale practical model while the future Mark X variants were computer graphics made by Moving Picture Company. In the film, the prototypes are said to be built using space-age polymers and are equipped with chest-mounted vent-like structures that grant flight capabilities as well as arm-mounted Gatling guns while the future Sentinels have become smaller, sleeker, and built with adaptive mechanical scales and hands that can reform into blades. This version of the Sentinel program was originally created in the 1970s, with Bolivar Trask experimenting on mutants to accelerate his research, though he found little success in gaining support for his project. After Mystique assassinated Trask in 1973, the U.S. government approved the Sentinel program, captured Mystique, and experimented on her to give the Sentinels the ability to adapt and utilize mutant powers. However, they subsequently target humans due to their potential for having mutant descendants, culminating in a dystopian future where most of humanity and mutantkind are nearly extinct by 2023. Using Kitty Pryde's new ability to project the minds of others into their past selves, the surviving X-Men project Logan's mind back into his 1973 self to rally Charles Xavier and Erik Lehnsherr's younger selves and avert Trask's assassination. Mystique defeats Lehnsherr, but Xavier and Hank McCoy convince her not to kill Trask, causing the U.S. government to realize that not all mutants are a threat to humanity and abandon the Sentinel program. The 1973 Sentinels from X-Men: Days of Future Past make a cameo appearance in X-Men: Apocalypse (2016) as Danger Room simulations. Video games The Sentinels