Then and now: the cast of the Avengers - The first 'Avengers' film came out in 2012, but a lot of the characters have had their own individual films.
Over the years the team has grown, and in the third film, 'Avengers: Infinity War,' the team looks set to add the Guardians of the Galaxy, Black Panther and Spider-Man to their ranks.
Some of the actors playing Earth's Mightiest Heroes were already well-established Hollywood actors before joining the Marvel adventure, while others made their name as their superhero characters.
Check out how these stars looked before and after joining the Marvel universe!

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Chris Evans - Captain America - Then: Here is Evans in 2001.

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Chris Evans - Captain America - Now: Evans is now 36 years old.

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Scarlett Johansson - Black Widow - Then: Johansson in 2001.

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Scarlett Johansson - Black Widow - Now: Scarlett is now 33 years old.

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Robert Downey Jr. - Iron Man - Then: Downey Jr. in 1999.

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Robert Downey Jr. - Iron Man - Now: RDJ is now 52.

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Chris Hemsworth - Thor - Then: Hemsworth in 2005.

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Chris Hemsworth - Thor - Before: Chris is now 34 years old.

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Jeremy Renner - Hawkeye - Then: Renner in 2003

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Jeremy Renner - Hawkeye - Now: Renner is now 47 years old.

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Tom Hiddleston - Loki - Then: Here's Tom in 2009.

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Tom Hiddleston - Loki - Now: Looking more distinguished aged 37.

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Mark Ruffalo - Hulk - Then: Questionable mustache choice in 2000.

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Mark Ruffalo - Hulk - Now: Ruffalo is now 50.

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Samuel L. Jackson - Nick Fury - Then: at the 'Phantom Menace' premiere in 1999.

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Samuel L. Jackson - Nick Fury - Now: Sam L. is now 69.

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Cobie Smulders - Maria Hill - Then: Looking fresh-faced in 2002.

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Cobie Smulders - Maria Hill - Now: Smulders is now 35.

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Gwyneth Paltrow - Pepper Potts - Then: Paltrow in 1998.

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Gwyneth Paltrow - Pepper Potts - Now: She is now 45.

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Elizabeth Olsen - Scarlet Witch - Then: Olsen in 2010.

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Elizabeth Olsen - Scarlet Witch - Now: The youngest Olsen sister is now 29.

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Aaron Johnson - Quicksilver - Then: the 'Kick-Ass' star in 2009.

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Aaron Johnson - Quicksilver - Now: Johnson is now 27.

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Paul Bettany - J.A.R.V.I.S/Vision - Then: Bettany in 2005.

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Paul Bettany - J.A.R.V.I.S/Vision - Now: Bettany is now 46.

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Don Cheadle - War Machine - Then: Here's Don in 2001.

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Don Cheadle - War Machine - Now: Cheadle is now 53.

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Anthony Mackie - Falcon - Then: Mackie in 2003.

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Anthony Mackie - Falcon - Now: Mackie is now 39.

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Josh Brolin - Thanos - Then: Brolin in 2000.

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Josh Brolin - Thanos - Now: Brolin is now 50 years old.

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Sebastian Stan - Bucky Barnes/Winter Soldier - Then: Stan in 2000.

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Sebastian Stan - Bucky Barnes/Winter Soldier - Now: Having barely aged a day, Stan is now 35.

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Chadwick Boseman - Black Panther - Then: Boseman in 2012.

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Chadwick Boseman - Black Panther - Now: Boseman is now 40.

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Paul Rudd - Ant-Man - Then: Paul Rudd in 2001.

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Paul Rudd - Ant-Man - Now: Rudd is now 48.

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Tom Holland - Spider-Man - Then: Here's Tom in 2012.

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Tom Holland - Spider-Man - Now: Tom is still just 21.

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Chris Pratt - Star Lord - Then: Pre-Star Lord in 2003.

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Chris Pratt - Star Lord - Now: Pratt is now 38.

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Benedict Cumberbatch - Dr. Strange - Then: Cumberbatch in 2004.

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Benedict Cumberbatch - Dr. Strange - Now: The Doctor is now 41.

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Zoë Saldana - Gamora - Then: Saldana in 2002.

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Zoë Saldana - Gamora - Now: Zoë is now 39.

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Vin Diesel - Groot - Then: Vin in 2000.

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Vin Diesel - Groot - Now: Diesel is 50 now.

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Dave Bautista - Drax - Then: Here's the actor and former wrestler in 2007.

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Dave Bautista - Drax - Now: Bautista is now 49.

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Bradley Cooper - Rocket Raccoon - Then: Coops in 2003.

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Bradley Cooper - Rocket Raccoon - Now: Bradley is now 43.

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