The films and shows of the DC Animated Movie Universe (DCAMU) have entertained viewers of all ages since the 1990's. With over three dozen titles available, people have gotten to see their favorite heroes in colorful action. In some cases, the films have expanded on the rich histories of many characters.

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While these releases are enjoyable as standalone pieces, DCAMU fans who haven't read the comics can be confused about some things they see. As a result, questions pile up with each film. To present a little clarity, here are 10 things that don't make sense in the DCAMU unless you read the comics.

10 Flash's Costume Change In The Flashpoint Paradox

In The Flashpoint Paradox, Barry Allen goes back in time to prevent his mother's murder at the hands of the Reverse-Flash. In doing so, he changes numerous events. For instance, Bruce Wayne's father becomes Batman and a war between Atlantis and the Amazons devastates parts of Europe. To correct it all, the Flash needs to stop himself from shifting the timeline.

Though everything is righted, some things are different. This includes Flash's costume, which resembles the one he wore when DC Comics initiated the New 52 era in 2011. Those who didn't read the comics wouldn't have known this unless they picked up the latest issue.

9 Constantine Asks Flash To Change The Timeline... Again

Those who rely on the DCAMU to keep track of their heroes might have noticed a shift in the way they were portrayed starting with Justice League: War (2014). When compared to their previous movies and shows, the League was noticeably younger and had new costumes. For some, this was just basic character progression. Some even joke that Barry's messing up the timeline again, as he's wont to do in his CW show. But in reality, this was another consequence of the New 52 era.

These versions of the characters remained the DCAMU's standard until Justice League Dark: Apokolips War (2020). With millions dead and the Earth devastated by Darkseid, the wizard John Constantine asks Flash to change the timeline once again. This refers to the Flashpoint event and the start of the Rebirth era at DC.

8 President Luthor

In Superman/Batman: Public Enemies, the Man of Steel and Dark Knight need to battle their colleagues due to the orders of President Lex Luthor. This is not an imaginary tale or an Elseworld alternate universe. On Prime Earth, Luthor became president during the 2000 election.

In the comic books, Luthor served as president for less than three years. While his administration was rife with corruption, he was smart enough to bring on several publicly approved people to legitimize his tenure. Among them was Clark Kent's childhood friend Pete Ross as vice president and Jefferson Pierce, the hero known as Black Lightning, as Secretary of Education. The movie itself was based on the first issues of Batman/Superman by Jeff Loeb and Ed McGuiness.

7 An Anxiety-Filled Green Lantern

In the DCAMU, Hal Jordan is the Green Lantern for Earth. On top of his solo appearance in Green Lantern: First Flight, he also had prominent roles in Justice League: Doom and The New Frontier. In 2018's Justice League vs. The Fatal Five, Hal was nowhere to be seen. Instead, he was replaced by an anxiety-filled Lantern named Jessica Cruz.

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Jess wasn't created for the DCAMU; her introduction was during the New 52 era. Anxious and fearful after seeing her friends murdered, Jessica initially takes on the role of a Yellow Lantern. Once the spirit within the ring dies, she's granted an emerald replacement. She and her partner Simon took over Earth's protection until Hal returned to his post.

6 Martian Manhunter Is A Cop

Superman and Batman aren't the only ones who have secret identities. J'onn J'onzz, known as the Martian Manhunter, also has one as a police detective. Although, DCAMU devotees might not have realized this, particularly if they watched the Manhunter on Justice League and Justice League Unlimited.

J'onn is rarely shown in human form on those shows and even then, he didn't portray a detective, which is his day job in the comics. The way curious fans could know more about his private eye days is to read New Frontier or his 1955 origin story.

5 There's An Evil Justice League

Justice League: Crisis on Two Earthreveals the parallel universe of Earth-Three. Here, warped versions of Superman, Batman, and Wonder Woman, among others, gather together to form the Crime Syndicate. Only one hero remains to defeat them -- Lex Luthor.

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This isn't something created solely for the DCAMU. The heroic Lex Luthor made a brief appearance during the comic book version of Crisis on Infinite Earths. Meanwhile, the first appearance of the Crime Syndicate dates back to the early '60s. Overall, Crisis on Two Earths is based on the graphic novel JLA: Earth 2.

4 Dick Grayson Is No Longer Robin

This one is somewhat of a stretch. You'd have to be a person who never watched an episode of The New Batman Adventures or Young Justice to not understand how Dick Grayson became Nightwing.

The switch isn't new. Dick replaced his green shorts with a blue and black outfit in 1984. Save for moments where he lost his memory or became a spy, Mister Grayson has maintained this heroic role in comics for nearly four decades.

3 Batman Has A Son

The newest Boy Wonder in the DCAMU is not Jason Todd or Tim Drake. It's Damian Wayne, the son of Bruce Wayne and Talia al Ghul. Introduced to the animated world in 2013, Damian's print appearance was much earlier.

To be exact, he first appeared in comics way back in 1987, though he was an infant at the time. He became an official part of the Wayne family in September of 2006 and the new Robin two months later.

2 Harley Is No Longer With The Joker

Aficionados of Batman: The Animated Series are quite familiar with Harley Quinn. Introduced as Joker's sidekick, she became a popular character in that series and the updated New Batman Adventures. She continues to be a huge star in the DCAMU, albeit with some changes. The biggest is she's no longer with Mr. J.

You can thank her comic book introduction for that. Since 1993, Harley's presence in DC's printed universe has continued to grow. As a result, the character has changed as well. She's become an independent antihero and leader who spends more time working with Batman and other heroes than hurting them.

1 Superman Is Russia's Man Of Steel

In the 2020 DCAMU release Superman: Red Son, we see an alternate universe where Kal's rocket landed in the Soviet Union instead of Smallville. In turn, he becomes a propaganda tool for a communist regime that eventually takes over the world. Along the way, he has to confront a Russian version of Batman and build an alliance with Princess Diana and the Amazons.

The film is based on the 2003 comic book mini-series of the same name. Where the movie compresses time, the printed version of Red Son tracks Kal from his appearance in 1953 to his "defeat" in the early 21st century.

NEXT: DCAMU: 5 Ways It Diverged From The Comics For The Better (& 5 For The Worse)