Universal Soldier Movies: Release Order
The Universal Soldier franchise follows reanimated soldiers enhanced into super-warriors, but has undergone multiple reboots and timeline changes throughout its history. The series began with the original Jean-Claude Van Damme and Dolph Lundgren film and has evolved through different continuities and tonal approaches.
This release order includes all feature films in the franchise, though note that two made-for-TV sequels from 1998 exist that aren't listed here. The series is known for its reboots and retcons, so be sure to check out the different timeline orders up top.
There are 2 other watch orders available – see the links up above.

Universal Soldier
A Vietnam War soldier killed in combat is revived 25 years later as part of a military program that creates super-soldiers with android enhancements. When his memory erasure fails, he begins experiencing flashbacks that threaten the entire operation.

Universal Soldier: The Return
Former Universal Soldier Luc Deveraux must battle SETH, a supercomputer-controlled warrior seeking revenge against its creators. In this man-versus-machine conflict, Luc faces off against a team of deadly perfect soldiers to prevent catastrophic destruction.

Universal Soldier: Regeneration
When terrorists threaten nuclear catastrophe at Chernobyl, decommissioned Universal Soldier Luc Deveraux is reactivated to stop them. He must face both his original nemesis and a seemingly unstoppable next-generation UniSol in this action-packed sequel.

Universal Soldier: Day of Reckoning
A widower seeks vengeance after his family is murdered, but finds himself hunted by an army of genetically enhanced Universal Soldiers led by a mysterious commander with his own agenda.
Other Film Series
Predator
Elite alien hunters stalk Earth throughout history, seeking the most dangerous prey in brutal combat.
RoboCop
A cyberpunk action series about a critically wounded police officer transformed into a cyborg law enforcer in dystopian Detroit.
Star Trek
A legendary science fiction franchise spanning multiple generations, following the adventures of Starfleet crews exploring the galaxy and upholding the ideals of the United Federation of Planets.
The Matrix
A groundbreaking sci-fi action series exploring the nature of reality through the story of Neo, a hacker who discovers the world is a computer simulation.
The Terminator
A sci-fi franchise about humanity's war against artificial intelligence and time-traveling cyborgs sent to alter the past.
Trancers
A sci-fi action series about Jack Deth, a time-traveling cop from the 23rd century hunting down zombie-like creatures called Trancers.