Kathryn Hahn Masterfully Sums Up The Entire MCU In One Song With Epic 'Agatha All Along' Promo

If you're not caught up on all the Marvel Cinematic Universe, Kathryn Hahn just saved you countless hours of laughter, heartbreak and Thanos' "giant purple testicles" chin with a brilliant promo for Agatha All Along, which recapped the entirety of MCU in one genius song.

Hahn was guest hosting Jimmy Kimmel Live! on Wednesday, and after announcing her guests—Seth Rogen and Agatha All Along costar Joe Locke—she told the audience:

"'Agatha' doesn’t premiere until September 18th on Disney Plus, but in the meantime, a lot of people have asked me if they need to watch every single Marvel movie and show in order to enjoy it."

"And the answer is no.”

The Knives Out star then told viewers that if they “want to get caught up with everything that’s going on in the MCU,” it would be her honor to fill them in... through “the power of song.”

Hahn then belted out a full-on NSFW CliffsNotes version of MCU to the tune of Gilbert and Sullivan's "I Am The Very Model," covering characters and major plot lines from both the MCU films and TV shows, with some witty commentary, to boot.

She finished up the number by setting up her Agatha promo:

"I could do this all night"

"But let's keep it tight..."

"Like Captain America's rear end."

The Step Brothers actor continued:

"And finally, this all leads up to a TV show starring the Marvel character who is the best, the coolest, the most bada** of it all..."

After Guillermo incorrectly and hilariously contributed "Hawkeye," Hahn shouted:

"No, not Hawkeye... Me! Agatha Harkness!"

She then wrapped up the tune:

"My character's an evil witch from many centuries ago."

"Yes, it's true, she was that b*tch, and now she's just an average Joe."

"Be sure to watch her new show, it's on Disney+ and starring me."

"This was all a shameless plug, and that's called corporate synergy."

You can watch below.

WARNING: NSFW language.

Viewers of Hahn's performance were rather impressed...

...and incredibly entertained.

Many also dropped some of their favorite moments from the number.

And they can't wait to see Hahn in action again.

Later in the episode, Hahn chatted with hercostar Joe Locke, who plays Billy Kaplan in Agatha All Along.

You can watch that segment below.

Joe Locke on Keeping Marvel Secrets for Agatha All Along, His Broadway Debut & Taylor Swift Concertyoutu.be

Agatha All Along premieres September 18 on Disney+.