What does Tesseract mean in Avengers?

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Tags

1. #avenger
2. #credits
3. #captain
4. #version
5. #first
6. #introduced
7. #universe
8. #where
9. #tesseract
10. #scene
11. #known
12. #marvel
13. #earth
14. #brought
15. #america
16. #centuries
17. #revealed
18. #cinematic
19. #custody