Avengers: Endgame is on track to become not only one of the biggest movies of this year, but of all time. Anticipation for the film has been built up by its dual purpose as both the direct sequel to the similarly huge hit, Avengers: Infinity War, and as the final chapter of the Marvel Cinematic Universe's first ten years. Though, as indicated by Marvel Studios next slate of releases, it by no means spells the end of the franchise as a whole. Thanks to a certain Snap-happy, purple alien, the top-billed cast is considerably smaller than the army of high profile actors that filled out its predecessor, though a lot of familiar faces remain. Most importantly – and thematically – the original six founding Avengers: Chris Evans as Captain America, Robert Downey Jr. as Iron Man, Scarlett Johansson as Black Widow, Mark Ruffalo as the Hulk, Chris Hemsworth as Thor, and Jeremy Renner as Hawkeye.

To their numbers, we can add Brie Larson as Captain Marvel, Paul Rudd as Ant-Man, Karen Gillan as Nebula, Bradley Cooper as Rocket Raccoon, Don Cheadle as War Machine, Danai Gurira as Okoye, and Gwyneth Paltrow as Pepper Potts. That's a whole lot of A-List talent in one three-hour cinematic extravaganza, something that's been a key selling point to convert non-comic book lovers to the MCU from the very beginning. You might think you know all there is to know about these stars, but we're here to prove you wrong with some obscure tidbits that probably flew under your radar.

CAPTAIN AMERICA? NO THANKS

Though it's hard to imagine anyone else frisbee-ing that vibranium shield around, Chris Evans was hesitant about taking the role of Captain America. Speaking to The Hollywood Reporter, the actor itted the nine-picture contract gave him "little panic attacks."

He turned down Marvel's first offer but, clearly keen, the studio then dropped the down from nine films to six. Still, Evans' answer was the same. "It's the ultimate job offer, on the biggest scale. I'm supposed to say no to this thing. It felt like the right thing to do." In the end, Robert Downey Jr. talked him around.

GOOPED

Gwyneth Paltrow's beauty and lifestyle business "Goop" has become infamous for churning out bizarre tips and products. Psychic vampire repellant spray, coffee enemas, camel milk and a steamer for your nether regions are just some of the questionable items the site has sold.

All, of course, with a massive price tag and suspect health benefits. Despite all the jokes at her expense, Paltrow's side hustle has been going strong for a decade now. An impressive run that the actress may have ruined when she confessed on Jimmy Kimmel Live in 2017, "I don't know what... we talk about!"

A RUDDY GOOD JOKE

If you regularly watch Late Night With Conan O'Brien, you should know what to expect by now every time Paul Rudd is invited on as a guest. The actor has made appearances on the talk show that span 15 years, and in that time, he's kept up the same prank.

Whenever Rudd has a movie to promote, rather than bring an appropriate clip from said movie to share with the host and his audience, Rudd instead plays the same scene from the obscure '80s film, Mac and Me. All these years later, it still gets Conan every time.

MAKE 'EM LAUGH

Of all the Endgame cast, few have had as long and storied a career in Tinseltown as Robert Downey Jr.. As well as becoming an honorary member of the Brat Pack of young Hollywood heartthrobs in the '80s, Downey Jr. found early success when he was cast in Saturday Night Live in 1985.

He was brought in by returning creator Lorne Michaels along with Anthony Michael Hall, Jon Lovitz, Randy Quaid, and others, to breathe new life into the flagging program. Unfortunately, Downey Jr. didn't have the talent for comedy he does now and wasn't asked to return for the next season.

ALL DOLLED UP

A lot of actors go by different names when they launch their careers. Sometimes this is to avoid being confused with an already-famous person of the same name, other times it's just an image thing. For Brie Larson, who is French-Canadian, the change was to make sure her name stuck in people's minds better.

Brie Desaulniers doesn't quite roll off the tongue for non-French speakers, so she decided to go for something simpler. Weirdly, her inspiration for a new surname came from her favorite childhood toy: an American Girl doll named Kirsten Larson.

MOTHER OF THANOS

Josh Brolin, while famous in his own right, also belongs to a famous Hollywood dynasty. Years after the ing of Brolin's mother, his father, James Brolin – also a well-known actor – married the iconic actress and singer, Barbara Streisand in 1998.

While not biologically related to Streisand, Brolin has a close relationship with his songstress step-mom. He affectionately referred to her as a "typical Jewish grandmother" after she became intensely involved in the birth of his first child. (We like to assume Brolin is a much better dad than his Marvel movie counterpart...)

A BAD IMPRESSION

Quite a few of the Avengers have hosted or made appearances on Saturday Night Live, including Bradley Cooper, who provides the snarky voice of Rocket Raccoon. In 2009, Cooper used his time on the sketch show to poke fun at then-Batman actor, Christian Bale.

Specifically, Cooper parodied Bale's viral rant from the set of Terminator: Salvation where he yelled at a production staff member for interrupting his performance. This might have made for a slightly awkward work environment when Cooper and Bale went on to star alongside each other in 2013's American Hustle...

I KISSED A WIDOW

Many a song has been written in a celebrity's honor, whether they know it or not. In the case of Katy Perry's breakthrough hit single, "I Kissed A Girl," it's the latter. Perry told Steppin' Out magazine in 2008 that she came up with the idea for the song after seeing Scarlett Johansson's photo in a magazine.

"I was with my boyfriend at the time, and I said to him, 'I'm not going to lie: If Scarlett Johansson walked into the room and wanted to make out with me, I would make out with her. I hope you're okay with that."

A MODEL CAPTAIN

Mystery Date is a board game where players try to find the right romantic match by choosing the right outfit and date activities. The 2005 version included a brand new set of matches to modernize the classic, one of which – a suitor named "Tyler" – looks exactly like Chris Evans.

Evans has never confirmed or denied whether he did work as a mid-'00s board-game model, but the resemblance is so uncanny that if it isn't him, the only other explanation is some illusionary doppelganger magic courtesy of Loki.

BALD-FACED LIES

Proving her commitment to playing psycho-cyborg, Nebula in the Guardians of the Galaxy and Avengers films, Karen Gillan always voluntarily shaves her head to better look the part under all that blue makeup and prosthetics.

When she did this to prepare for the first Guardians film, her bold new look generated a lot of strange rumors, including one that claimed she donated her shorn locks to the hair makeup department of Star Wars: The Force Awakens. Gillan denied this while speaking to the BBC at the film's premiere, calling it a "miscommunication."