Instagram | @joshbrolin

'Avengers: Endgame' Cast Assembled To Sing 'Happy Birthday' To Josh Brolin On Set

Ever wondered what it would look like if the Avengers stopped in the middle of the battlefield and serenaded Thanos with a birthday tune?

Well, wonder no more.

This must've been one of the 14 million attempts to stop Thanos that DIDN'T succeed.

In a video posted to his Instagram, actor Josh Brolin (AKA Thanos) showed how his 'Avengers: Endgame' co-stars helped celebrate him turning 50 on set.

All our favorites are present and accounted for during the number, including Ant-Man, Black Panther, and more.

At the front of the group is Robert Downey Jr., expertly leading the song with his unique flair and arm gestures.

There was no shortage of Avengers present.

He is flanked by Paul Rudd on one side of him, and the three Chris' on his other (that is, Chris Hemsworth, Chris Pratt, and a sheepish looking Chris Evans: the 'Holy Trifecta', if you will.)

Always the funny man, Pratt attempted to mimic Hemsworth's elaborate dance moves.

During the video, Pratt can be seen trying to follow along as his co-star steals the show with some fancy arm work.

It's easy to imagine all of this happening in character.

Pratt even finished off the number with lots of finger guns as the rest of his co-stars clapped for Brolin.

This isn't the first time the Marvel gang has gotten a bit musical.

On the Tonight Show with Jimmy Fallon last year, the cast came together to sing a little parody of The Brady Bunch theme song.

Not all of them have the best pipes, but they try their best.

Having superpowers doesn't guarantee you a beautiful singing voice, unfortunately. Check out their last foray into music above!

Their song for Brolin, however, was even sweeter.

Instagram | @joshbrolin

It wasn't done for a TV show, or to promote the film — it was just a group of friends all singing to celebrate a friend's milestone birthday.

Brolin's caption on the video makes it even more special.

Instagram | @joshbrolin

"I was never able to post this before, for obvious reasons. But behind all the hate, all the misunderstandings, all the bruises, bumps, and ashes, there was this on my 50th birthday," he wrote.

He ended the post with a not-so-popular #teamthanos.

"So deep deep down, even from these guys and gals, everyone has a little purple love in them," he wrote.

Check out the amazing video above. You won't regret it.

We're sure Brolin had a wonderful birthday, thanks to this magnificent group of people.

Watching all the Avengers sing 'Happy Birthday' together, some dressed in costume while others are only partially, is truly something to behold.

Our next birthday wish? Have the Avengers assemble at our party to sing to us, too. Hopefully they'll start doing birthday parties.