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

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

Number of times: 1
When: World War Z.

3. Tom Cruise

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

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

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

6. Sylvester Stallone

Number of times: 2
When: Rambo, Demolition Man.

7. All the actors playing James Bond

Number of times: 23

8. Chris Evans

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

9. Robert Downey Jr.

Number of times: 4
When: Iron Man, Iron Man 2, The Avengers, Iron Man 3,  

10. Chris Hemsworth

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

11. Kiefer Sutherland

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

12. Bruce Willis

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

13. Joseph Gordon Levitt

Number of times: 1
When: Looper

14. Leonardo DiCaprio

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

15. Patrick Stewart

Number of times: Countless times
When: Star Trek: The Next Generation

16. Christian Bale

Number of times: 3
When: All the Batman movies.

17. Nicolas Cage

Number of times: 1
When: Ghost Rider

18. Harrison Ford

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

Number of times: 1
When: The Book of Eli