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In the upcoming "Avengers" film, Robert Downey Jr. reprises his role as the playboy-turned-inventor-turned-hero Iron Man. But what would his net worth be if he was a real person?

Forbes crunched the numbers and came up with an incredible figure: $9.3 billion (in comparison, Forbes estimated Steve Jobs was worth $7 billion at the time of his death and Facebook's Mark Zuckerberg is worth $17.5 billion).

That $9.3 billion figure puts Iron Man fifth on Forbes' list of the Fictional 15 -- the wealthiest characters in film.

So who tops the list? The dragon Smaug from J.R.R. Tolkien's "The Hobbit," which is coming to the big screen in December! Described as possessing "countless piles of precious things," including pillaged gold and jewelry, Smaug's net worth is around $62 billion ($3 billion more than Bill Gates).

A surprise No. 3? "Twilight" patriarch Carlisle Cullen (played by Peter Facinelli). Forbes estimates his wealth at over $36 billion, thanks to smart investing, vampiric immortality and compounding interest. How else could he give Esme an island as a wedding gift?

Another billionaire turned crimefighter, Bruce Wayne (played by Christian Bale), comes in around $6.9 billion. Having those extra billions around help when you need to develop, say, a Batwing.

The richest woman? Lisbeth Salander (played by Rooney Mara) from "The Girl With the Dragon Tattoo." She "acquired" her $2.4 billion through hacking others' bank accounts.

Check out the Fictional 15 below and head over to Forbes to see how they came up with these figures.

1. Smaug ("The Hobbit") $62 billion
2. Flintheart Glomgold (Scrooge McDuck's archnemesis) $51.9 billion
3. Carlisle Cullen ("Twilight") $36.3 Billion
4. Jed Clampett ("Beverly Hillbillies") $9.8 billion
5. Tony Stark ("Iron Man") $9.3 Billion
6. Richie Rich $8.9 Billion
7. Charles Foster Kane ("Citizen Kane") $8.3 Billion
8. Bruce Wayne ("Batman") $6.9 Billion
9. Forrest Gump ("Forrest Gump") $5.7 Billion
10. Mr. Monopoly aka Uncle Pennybags $2.5 billion
11. Lisbeth Salander ("The Girl With the Dragon Tattoo") $2.4 Billion
12. Tywin Lannister ("Game of Thrones) $2.1 Billion
13. C. Montgomery Burns ("The Simpsons") $1.3 Billion
14. Robert Crawley ("Downton Abbey") $1.1 Billion
15. Jo Bennett ("The Office") $1 Billion

As ridiculous as some of these figures sound, the Kardashians renewed "Keeping Up With the Kardashians" for $40 million, TMZ reports. They're fictional too, right?

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