The trailer for Matt Reeves' Joker to appear alongside an adult Batman, following an appearance by a young Bruce Wayne in the villain's origin story. Now that the teaser has been released online for The Batman, starring Robert Pattinson in the title role, audiences look to be receiving a Batman film that appears to be as dark and gritty as the Taxi Driver-inspired Joker movie was in 2019. Paul Dano's Riddler resembles the Zodiac killer as seen in David Fincher's Zodiac (a thriller set in the late '70s), and comparisons have already been made between The Batman and Fincher's other iconic crime thriller Seven. The dark palette shared between the three movies create a natural path that leads to Joker, which was lauded for its adult take on comic book material. With a Joker yet to be cast for The Batman franchise, could Phoenix's Joker be the perfect fit?

Although The Riddler, who appears to be a serial killer with a grudge.

Related: The Batman: Biggest Unanswered Questions From The Trailer

The street-level focus of The Batman already brings it to the point of being the perfect world for Joaquin Phoenix's Joker; a man who is rocked by multiple tragedies in his personal life and a society that either steps on or around him. There are no superheroes in Joker; just bad people and corrupt politicians, leading one crazed clown to claim his own kind of vengeance. The Gotham of The Batman doesn't look like it has any superheroes either; just a man dressed all in black claiming "I'm vengeance." With DC introducing their Multiverse for 2022, The Batman and Joker now have the potential causality to interact. Here's why The Batman trailer teases the perfect world for Joaquin Phoenix's Joker.

Gotham's 'Giant Rat' Problem Is In Reeves' World Too

Colin Farrell as The Penguin in The Batman looking angry in the rain

In paying homage to Taxi Driver, which was filmed during a sanitation strike in New York City, Joker too is set during a sanitation strike. Piles of garbage bags litter the streets of Gotham, and the emergence of 'super rats' is documented on the nightly news. At one point a giant rat is seen crossing the sidewalk as Arthur Fleck (Phoenix) uses a phone booth. The entire giant-rat motif is a metaphor for the corruption and filth of Gotham City, and a similar vibe is used in the world of The Batman. In the trailer for The Batman, we see a brief glimpse of the City of Gotham Sanitation Eastside Depot. The setting looks to be where local gangster the Penguin - played by an unrecognizable Colin Farrell - looks to be engaging in some nefarious criminal activities.

Elsewhere in the trailer for The Batman, the Caped Crusader tussles with some GD officers in their own headquarters, and we get a menacing look from Commissioner Pete Savage (Alex Ferns) as he addresses the press. According to Reeves, when talking about his HBO Max GD spin-off show, "the history of corruption in Gotham is enormous and goes back many years", so it's fair to assume that Commissioner Savage and the officers tussling with Batman are going to be corrupt individuals. The 'giant rat' problem extends from the Gotham of Joaquin Phoenix's Joker all the way to the Gotham of The Batman. Gotham will always be depicted as a terrible city in desperate need of a clean-up, but in Joker and The Batman, the city seems to be plumbing new depths, perfect for the two to co-inhabit.

The Batman & The Joker Are Both Against Corruption

The Batman Trailer Funeral Hostage

As the corruption of Gotham's authorities has been established in both Joker and The Batman, with Batman obviously standing against such corruption, it's equally plausible to establish a link between Batman's anti-corruption stance and Joker's anti-authoritarianism. Dating back to big appearance on Murray's show. Fleck becomes a symbol for the rising distrust in Gotham's politicians and wealthy elite, representing the downtrodden and forgotten people at the other end of society's ladder. His anti-corruption stance reflects Pattinson's Batman in The Batman, allowing for another perfect crossover of the characters into each other's worlds.

Related: The Batman Makes The Silliest Live-Action Aspect Awesome

Reeves' Noir Tone Perfectly Suits Phoenix's Joker

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Whilst Matt Reeves is perhaps best known for his sequels to Matt Reeves recently went on record at DC FanDome stating how the film was inspired by Taxi Driver - which also served as an inspiration for Joker.

How A Cross-Over Could Work

Robert Pattinson as Batman Alongside Joaquin Phoenix as Joker

The Joaquin Phoenix-starring Joker was set in 1981 and The Batman appears to be set in the modern day (considering the amount of modern tech glimpsed in the trailer), meaning that Arthur Fleck would have to be forty years older by the time Pattinson's Batman begins hitting the streets. As DC having announced their cinematic Multiverse, it's more likely that fans could Robert Pattinson's Batman cross the time stream into a parallel reality where it's 1981 and he encounters Phoenix's Joker - or vice versa, with Phoenix's Joker appearing in the present day of The Batman. Alternatively, DC can cast Joaquin Phoenix for The Batman 2, but explain it away as being a parallel version of the Joker from Joker that exists in that world's modern day.

Next: All 29 & In-Development DC Films