Is Swamp Thing a villain?

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Tags

1. #heroes
2. #chemicals
3. #conceived
4. #started
5. #famous
6. #caught
7. #probably
8. #plant
9. #villains
10. #explosion
11. #monster
12. #holland
13. #thing
14. #originally
15. #swamp
16. #combined
17. #based
18. #scientist