Targeting keywords with special characters

I am trying to target a keyword with the word "spider-man" in it. So which one do I target exactly?

1. spider-man
2. spider man
3. spiderman

Which one of these is correct and should I build links to?

Anyone? I need help on this matter.

My opinion: If you're targeting "spider-man" then you should build links to spider-man (exact keyword)

You should use all variations.

"Spider-man" and "spider man" are the same keywords to Google so they'll return virtually (if not completely) the same results. "Spiderman" on the other hand is more different from the other two than they are from each other.

Therefore, you can build links using any of those keywords (I recommend you use all). If you rank well for one, you'll certainly rank well for the other two.