Avengers 4 still doesn't have a title, but a lot of fan theories have suggested what the big Marvel movie could be called. It will be when the Avengers 4 trailer releases, presumably in the last week of November, that audiences will finally know the title of the movie. For now, though, it's very much open to speculation.

What makes this mystery all the more intriguing are the constant tidbits coming from co-directors Anthony and Joe Russo and Marvel mega-producer Kevin Feige about what the title is (or, more accurately, isn't) and what it could mean for the plot of Avengers 4. Everything, from Doctor Strange's long-term plan against Thanos potentially being focused on, to potential additional enemies for our heroes to face off against.

Related: What If Avengers 4's Villain Isn't Thanos?

Here's a selection of the biggest Avengers 4 title theories and why, for all their logic, they're probably wrong. After all, Marvel has never been a film studio who like fans to guess their moves correctly.

Avengers: End Game

Avengers End Game

One of the longest-held theories about the Avengers 4 title is that it will be End GameAvengers: Infinity War's cliffhanger ending saw Thanos victorious, wiping half of the universe from existence with the power of all six Infinity Stones. However, that success may be short-lived. It's heavily implied that Doctor Strange just giving Thanos the Time Stone was part of a secret plan to create the 1 in 14,000,605 future where the Avengers win. After Thanos left Titan, Strange told Tony Stark "We're in the end game now". The theory goes that Avengers 4 will be all according to Strange's vision and thus his end game.

Since then, there have been several other clues for this title, including LinkedIn profiles and cryptic social media posts. However, it can't be true, as Joe Russo has confirmed that the title of Avengers 4 was not stemming from any dialogue spoken in Infinity War. Unless he was lying, End Game is out.

Avengers Assemble

Thanos Says Avengers Assemble

The Avengers' famous battle cry has never been uttered on film, much to the dismay of fans. Audiences almost had Captain America come out with it at the end of Avengers: Age of Ultron, but in classic Joss Whedon style, the credits cheekily rolled just as Cap opened his mouth.

Related: Avengers 4 Theory: Thor Dies To Complete The REAL Ragnarok

As such, this may be a suitable title for Avengers 4. After all, next year's Phase 3-closer will find all the remaining Avengers assembling to finally defeat Thanos. This was seemingly backed up by the Russos on social media, who poster a mysterious image of Joe Russo working on set with the caption "Look hard..." This was assumed to include a nod to the title, and while many gravitated towards End Game, several thought the two large "A" structures were a clue to Avengers Assemble.

However, this title is unlikely to be taken by Avengers 4 as it was already used for the first Avengers movie in the UK, where they had to avoid a legal clash with spy TV show The Avengers.

Avengers: Eternity

Thanos and Eternity

The theory that Avengers: Eternity was the title came about after the Russos revealed that Avengers: Forever was the closest guess to the title that anyone had made. Eternity is a cool-sounding title, and ties in with what many believe to be a time travel plot in the movie, not to mention another obscure tease by the directors on social media which has since been deleted.

Read More: Eternity War: The Best Avengers 4 Title Contender

If true, this would have some serious implications for Avengers 4's plot. Eternity is actually a cosmic being in the Marvel Universe; the anthropomorphic representation of the entire universe. Generally acting as a god, the being is largely benevolent, and has helped Earth's heroes to defend existence in the past. While more villains are expected in Avengers 4, the likelihood of seeing Eternity on-screen is less likelygiven the abstract nature of the concept. That this is a real title has been refuted by industry sources multiple times.

Avengers: Aftermath

Avengers Infinity War Ending

The very same since-deleted Instagram post that led some to believe the title of Avengers 4 was Avengers: Eternity, is also responsible for some believing that the title will be Avengers: Aftermath. It comes from the title of a piece of art; "Infinity Mirrored Room: Aftermath of Obliteration of Eternity". The title ties in with the soundbite from producer extraordinaire Kevin Feige that the title for Avengers 4 was a spoiler for Infinity War; a title like Aftermath would reveal that Thanos won.

The fact that the Russos deleted their post led to a lot of fans feeling they were correct in their guessing, but it could also be seen as major trolling on the directors' part.

Page 2 of 2: More Avengers 4 Title Theories

Mark Ruffalo and Hulk in Avengers Infinity War

The Last Avenger

Following the supposed leak of the title, Mark Ruffalo went on The Tonight Show Starring Jimmy Fallon, to reveal the real name for Avengers 4. In the moment, his title reveal was ultimately bleeped-out, in yet another case of trolling fans over the film's title. However, fans edited the bleep to reveal what Ruffalo actually said: The Last Avenger.

Related: Thanos Origin Book May Tease Avengers 4's New Villains

It's more than likely that this faux title was something for Ruffalo to say in the moment as part of the bit, rather than the actual title of the film. After all, Marvel, notably secretive about their perennial upcoming slate of movies, wouldn't allow an actor to say the film's real title in a public place even if he was bleeped out on television. It's also worth noting that the title doesn't exactly make too much sense, given how it will focus on the team overcoming great odds and bringing even more dead heroes back to life.

Avengers: Infinity Gauntlet

When Avengers 4 was first announced, it was as Avengers: Infinity War - Part 2. While that subtitle was eventually removed, many theories still held close to the "Infinity" nomenclature, with many suggesting that iconic comic arc Infinity Gauntlet would give its name to the sequel. This has been backed up by plot rumors that suggest Tony Strak will make his own Gauntlet in a bid to undo Thanos' snap.

Adding fuel to the fire, during production, Zoe Saldana referred to the fourth film as "Gauntlet", although Guardians of the Galaxy director James Gunn suggested that she probably misspoke. Kevin Feige also confirmed it was not Avengers 4's title.

Avengers: Annihilation

Avengers 4 Title Annihilation

The most popular of all the title theories is supposed leak Avengers: Annihilation. The theory was first laid down by CBR in April, and it was later reported as being an official leaked title by multiple sites.

Related: All The Evidence Avengers 4's Title Is Annihilation

In the Annihilation comic, Thanos was forced to team up with the galaxy's heroes, believing Annihilus - a bug-like alien from the Negative Zone with designs on wiping out all life in the universe - to be a "mad creature". Avengers 4 toy descriptions mention another villain for the movie other than Thanos, although whether the film would follow the comic at all accurately is unlikely.

Avengers: Annihilation also matches up with a lot of the clues provided by the film's creators: it's not a word spoken aloud in Infinity War; it does slightly spoil the events of that movie as well; it's similar to Avengers: Forever in its totality; there's  two "As" discernible in the mysterious behind-the-scenes photo from the Russos; and the art piece titled "Aftermath of Obliteration of Eternity" could also be interpreted as a fancy way of saying "Annihilation".

All that said, Avengers: Annihilation is hardly the most exciting title it could possibly be, with many fans decrying it for its blandness. Even if it was originally planned as said title, we wouldn't put it past Marvel to change it retroactively in order to preserve a surprise for fans. While it's the most likely of all the Avengers 4 theories, don't put your life savings on its odds just yet.

Next: Avengers 4: Every Update You Need To Know

Key Release Dates