Real life heroes exist in many forms. They're doctors, scientists, religious folk, charity workers, and so on. Of course, saving the world on your own is nearly impossible, unless you're one of these actors who have done plenty to save the world, or America... in these movies.

1. Will Smith
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Number of times: 9
When: Independence Day, MIB, MIB II, MIB III, Wild Wild West, I, Robot, I Am Legend, Hancock, After Earth.

2. Brad Pitt
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Number of times: 1
When: World War Z.

3. Tom Cruise
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Number of times: 13
When: Legend, Top Gun, Mission: Impossible, Mission Impossible II, Minority Report, War Of The Worlds, Mission Impossible III, Knight & Day, Mission: Impossible - Ghost Protocol, Jack Reacher, Oblivion, All You Need Is Kill, Edge of Tomorrow. 

4. Keanu Reeves
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Number of times: 9 (Although some of them are debatable)
When: Bill & Ted's Excellent Adventure, Bill & Ted's Bogus Journey, Dracula, Johnny Mnemonic, Chain Reaction, The Devil's Advocate, Matrix Trilogy, Constantine, Scanner Darkly, The Day The Earth Stood Still

5. Arnold Schwarzenegger
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Number of times: 6
When: Terminator 2, Predator, End Of Days, Last Action Hero, True Lies, Total Recall

6. Sylvester Stallone
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Number of times: 2
When: Rambo, Demolition Man.

7. All the actors playing James Bond
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Number of times: 23

8. Chris Evans
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Number of times: 4
When: Fantastic Four, Captain America: The First Avenger, The Avengers, Captain America: The Winter Soldier.

9. Robert Downey Jr.
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Number of times: 4
When: Iron Man, Iron Man 2, The Avengers, Iron Man 3,  

10. Chris Hemsworth
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Number of times: 3
When: Thor, The Avengers, Thor: The Dark World.

11. Kiefer Sutherland
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Number of times: 9
When: All of 24's seasons.

12. Bruce Willis
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Number of times: 6
When: Fifth Element, Armageddon, Die Hard 2, A Good Way To Die Hard, Surrogates, Mercury Rising

13. Joseph Gordon Levitt
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Number of times: 1
When: Looper

14. Leonardo DiCaprio
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Number of times: 2
When: J. Edgar, The Man in the Iron Mask

15. Patrick Stewart
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Number of times: Countless times
When: Star Trek: The Next Generation

16. Christian Bale
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Number of times: 3
When: All the Batman movies.

17. Nicolas Cage
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Number of times: 1
When: Ghost Rider

18. Harrison Ford
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Number of times: 8
When: Star Wars Episode IV: New Hope, Star Wars: Episode VI Return of the Jedi, Indiana Jones and the Raiders of the Lost Ark, Indiana Jones and the Temple of Doom, Indiana Jones and the Kingdom of the Crystal Skull, Air Force One, Hanover Street, Ender's Game.

19. Denzel Washington
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Number of times: 1
When: The Book of Eli