The DC Extended Universe (DCEU) is a shared universe centered on a group of film franchises based on characters by DC Comics and distributed by Warner Bros. Pictures. Despite numerous film franchise in the past on characters such as Superman and Batman, none of those film series were connected. The DCEU debuted in 2013 with Man of Steel, centered on Superman, and has grown to include other characters such as Batman, Wonder Woman, and several others included in this list. The shared universe, much like the original DC Universe in the comics, was established by crossing over common plot elements, settings, cast, and characters, and crossed over with separate timelines from other DC-licensed film series in The Flash to create a "multiverse" before being largely rebooted as the new DC Universe franchise under new management from DC Studios, with the previous universe concluding in 2023 with Aquaman and the Lost Kingdom.

The DCEU centers mostly on superhero characters, including the members of what would become the Justice League, but also features antiheroes such as Floyd Lawton / Deadshot, Harleen Quinzel / Harley Quinn, Christopher Smith / Peacemaker, and Teth-Adam / Black Adam.

Clark Kent (portrayed by Henry Cavill, Channing Tatum, David Corenswet and more), born Kal-El, is a Kryptonian refugee sent to Earth by his parents Jor-El and Lara Lor-Van prior to the planet's destruction and is raised by Jonathan and Martha Kent in Smallville, Kansas. As the Sun's radiation enhances his cells, Clark develops superhuman abilities, but struggles with his identity when Jonathan reveals his otherworldly origins. After Jonathan's death, Clark travels the world trying to find himself and eventually discovers his true identity after finding a Kryptonian scout ship. He eventually embraces his powers after learning from his biological father's hologram, gaining the military codename Superman as he uses his powers to protect the Earth's citizens. Superman eventually comes to odds with Batman before finding commonality and inspires Batman and other vigilantes and metahumans to band together and protect the world from greater threats.

Cavill is the first non-American actor to portray Superman in film. In addition, Zack Snyder has aimed to give Superman a more realistic arc in his DCEU films as opposed to in the past and not be a "one-dimensional Boy Scout".

Bruce Wayne (portrayed by Ben Affleck) is the multibillionaire CEO of Wayne Enterprises, but secretly moonlights as the feared vigilante Batman in an effort to battle crime in Gotham City, taking inspiration from his parents' deaths and his fear of bats to crack down on criminal activity. He has been active as Batman for 20 years prior to Clark Kent's emergence as Superman, becoming jaded and disillusioned over time, especially after the murder of his protégé Robin. Bruce antagonizes Superman after personally witnessing the Battle of Metropolis, in which the ruckus caused by the Kryptonians destroys a considerable part of the city, including the destruction of Wayne Tower and the deaths of a large portion of Wayne's workforce in Metropolis. He is determined to kill the Man of Steel until finding commonality with him and later becomes inspired by Superman's selflessness and sacrifice, later recruiting other metahumans around the globe to form the Justice League and embarking on a path to redemption after years of moral ambiguity.

The DCEU iteration of Batman is notably older and more battle-weary than previous cinematic portrayals. Affleck's Batman is described as the "angriest we'd ever seen" by Screen Rant, and was inspired by Frank Miller's The Dark Knight Returns comic storyline.

Diana of Themyscira (portrayed by Gal Gadot), commonly known by her civilian name Diana Prince, is an immortal Amazon warrior from the hidden island of Themyscira who is the daughter of Hippolyta, the queen of the Amazons and the Greek God, Zeus, the king of the Olympians. Upon venturing to the world of Men after Steve Trevor crash-lands on Themyscira and warns of a global conflict threatening the world, Diana begins protecting mankind as Wonder Woman, secretly living amongst humanity while ending conflicts for nearly 100 years and gradually learning more about the world after living a sheltered life on Themyscira. Diana is inspired by Steve's bravery and learns to find the goodness in mankind, despite evil existing in the world. She is brought back to the forefront after an extraterrestrial threat emerges, with Bruce Wayne recruiting her and other metahumans to fight against the forces of Apokolips.

Despite being part of DC Comics' main "trinity" of superhero characters alongside Superman and Batman, Wonder Woman did not debut on the silver screen until her appearance in Batman v Superman in 2016. Gadot was originally offered the role of Faora in Man of Steel, but turned it down due to pregnancy at the time. This paved the way for her casting as Wonder Woman, with Zack Snyder saying she had the "magical quality" that made her perfect for the role.