Marvel fans have spent years debating who will become the central hero of the next Avengers movie. While Doctor Doom is expected to be the major threat, one character could hold the key to the entire story: Loki, the God of Mischief.
Played by Tom Hiddleston, Loki has evolved from Thor’s jealous brother into one of the Marvel Cinematic Universe’s most complicated and powerful characters. His journey through the Disney+ series Loki changed his relationship with time, destiny, and the multiverse.
Now, with Avengers: Doomsday bringing together heroes from different universes, Loki could become far more important than a supporting character. But could he actually be the main character of the movie?
1. Loki’s Ending Changed the Future of the MCU
The biggest reason Loki could play a central role in Avengers: Doomsday comes from the ending of Loki Season 2.
Throughout the series, Loki discovers that the Time Variance Authority (TVA) has been controlling timelines to maintain a predetermined order. As the story progresses, he realises that saving the multiverse may require a sacrifice greater than anything he has faced before.
In the finale, Loki takes responsibility for the branching timelines, holding them together in a new arrangement that resembles a vast tree.
This moment transforms his character completely. Instead of pursuing a throne for personal glory, Loki accepts an enormous burden to protect countless lives.
His new position could make him one of the most important figures in the Multiverse Saga.
If the multiverse faces another existential crisis in Avengers: Doomsday, Loki’s experience could become essential to understanding what is happening and how the heroes might survive.
2. Loki Could Be the Key to Understanding Doctor Doom
Doctor Doom, portrayed by Robert Downey Jr., is the central threat announced for Avengers: Doomsday. However, Marvel has not yet confirmed the exact connection between Doom and Loki.
This uncertainty creates an interesting possibility.
Doom is a brilliant scientist and powerful sorcerer in Marvel Comics. His ambitions often extend beyond ordinary political power, and his stories can involve reality itself.
Loki, meanwhile, has developed a unique understanding of timelines and the consequences of manipulating them.
If Doom’s actions threaten multiple realities, Loki could be among the few characters capable of understanding the full scale of the danger.
He might recognise the threat before the Avengers do, help explain why different universes are colliding, or become the person who knows what must be sacrificed to prevent a catastrophe.
These are theories rather than confirmed plot details, but they provide a compelling reason for Loki to have a major role in the story.
3. Could Loki Be More Powerful Than Ever?
For much of his MCU journey, Loki relied on magic, deception, and clever strategies to defeat stronger opponents.
His transformation at the end of Loki Season 2 changes that perception.
He demonstrates an extraordinary ability to influence the fate of branching timelines, although Marvel has not established a simple ranking of his power compared with every other character in the MCU.
This distinction matters because Avengers: Doomsday is expected to involve a threat unlike anything the heroes have encountered before.
Ordinary strength might not be enough to defeat Doom. The Avengers may need someone who understands the structure of the multiverse itself.
Loki could provide that advantage.
However, his role may not involve defeating Doom in a conventional fight. He could instead become the character whose decisions determine whether the heroes have any chance of winning.
4. Loki’s Story Could Connect the Avengers, Fantastic Four and X-Men
One of the most exciting aspects of Avengers: Doomsday is its combination of characters from different Marvel universes.
The official cast includes familiar Avengers, members of the Fantastic Four, and returning X-Men characters. Their involvement suggests that the conflict will extend beyond the experiences of a single superhero team.
But bringing these characters together raises an important question: what connects their worlds?
Loki’s storyline offers one possible explanation.
Because the events of his series explore branching timelines and the multiverse, his character could provide a narrative link between different realities.
Imagine the Avengers discovering that their world is approaching a catastrophic event, while the Fantastic Four investigate the scientific consequences and the X-Men confront dangers affecting their own universe.
Loki could be the character who understands how these events fit together.
Marvel has not confirmed that this will happen, but it would allow the studio to connect the Multiverse Saga’s major storylines through a character audiences already know.
5. Loki and Thor Could Have the Most Emotional Reunion
Another reason Loki could be central to Avengers: Doomsday is his relationship with Thor.
Their story has always been about more than rivalry. Beneath Loki’s jealousy and deception was a complicated desire for recognition, belonging, and acceptance.
Since the events of Avengers: Infinity War, Thor has had to live with the loss of the Loki he knew. The Loki who survives through the events of the Disney+ series follows a different journey and develops into a different person.
If these versions of the characters meet again, their reunion could carry enormous emotional weight.
Thor might discover that his brother has become responsible for protecting something far greater than either of them once imagined.
At the same time, Loki could face a personal conflict between the family he once wanted and the responsibility he has now accepted.
Such a reunion could give the movie an emotional centre beyond its multiversal battles.
6. Will Loki Actually Be the Main Character?
There is an important difference between being a major character and being the main character.
Marvel has officially confirmed Tom Hiddleston’s involvement in Avengers: Doomsday, but it has not announced Loki as the film’s central protagonist.
Doctor Doom is positioned as the major threat, while the large ensemble cast suggests that several characters will drive the story.
Loki could be the key to the multiverse plot without receiving the most screen time. Alternatively, his role might be smaller than fans expect, with his greatest contribution saved for Avengers: Secret Wars.
The latter possibility is especially interesting because Doomsday and Secret Wars are part of the same larger cinematic storyline.
Marvel could use the first film to establish Loki’s importance before exploring the consequences of his decisions in the next chapter.
Final Verdict: Loki Could Be the Hidden Key to Avengers: Doomsday
Loki has one of the strongest narrative connections to the multiverse in the MCU. His transformation, his understanding of branching timelines, and his emotional history with Thor make him a natural candidate for a major role in Avengers: Doomsday.
That does not mean he will definitely be the main character. Marvel has confirmed his casting, not his precise importance to the plot.
Still, there is a compelling possibility that the battle against Doctor Doom will require more than the Avengers’ combined strength. It may require someone who understands the multiverse and has already sacrificed everything to protect it.
And that could make Loki one of the most important characters in the entire Multiverse Saga.
Avengers: Doomsday is scheduled to arrive in cinemas on December 18, 2026. Until Marvel reveals more about Loki’s role, the God of Mischief remains one of the most intriguing characters to watch.