Marvel's cinematic universe has hit some rough patches since Endgame, but the upcoming Avengers: Doomsday looks poised to reignite the spark. The new trailer, which shattered records with 503 million views, introduces Robert Downey Jr. as Doctor Doom—a bold twist that initially raised eyebrows but now seems like a masterstroke. The film assembles the X-Men, Fantastic Four, and New Avengers under Thor's leadership to face this formidable foe. But there's one crucial piece of the puzzle that only Disney+ subscribers will fully appreciate.

Loki's Journey: From Villain to God of Time

Tom Hiddleston's Loki met a heroic end in Infinity War, sacrificing himself to stop Thanos. But thanks to the time heist in Endgame, a 2012 version of the God of Mischief escaped with the Tesseract—only to be snatched by the Time Variance Authority (TVA). His self-titled Disney+ series follows this alternate Loki as he confronts his past, forms an unlikely bond with Mobius (Owen Wilson), and ultimately embraces his true destiny as the overseer of all time.

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This isn't just a side story—it's the most profound character arc in the MCU. By the end of Season 2, Loki becomes selfless, sacrificing his freedom to protect the multiverse. The tragedy? Thor never learns of his brother's transformation. That emotional weight will hit hard when the brothers reunite in Avengers: Doomsday.

Why Skipping 'Loki' Hurts the Experience

Without watching the series, Thor and Loki's reunion may feel confusing or unearned. The show lays the groundwork for Loki's growth from a selfish trickster to a genuine hero. It also introduces key concepts like the Sacred Timeline and the TVA, which are central to Avengers: Doomsday's plot. As the trailer hints at a 'Time Runs Out' adaptation, understanding Loki's role as the time god becomes essential.

Hiddleston reprises his role for the first time since the show's finale, and his performance promises to be one of the film's emotional anchors. The reunion with Thor—who still believes his brother dead—will be devastatingly beautiful, but only if you've witnessed Loki's journey.

What to Watch Before 'Avengers: Doomsday'

While Loki is the must-watch series, other MCU Disney+ shows like WandaVision and The Falcon and the Winter Soldier also set up elements for the film. But for the core emotional payoff, nothing beats Loki. It's streaming now on Disney+, and with Avengers: Doomsday on the horizon, there's no better time to catch up.

Don't be the fan who shows up unprepared. Watch Loki—it's the key to unlocking the most anticipated reunion in Marvel history.