1. Captain America
2. Black Widow/ Natasha Romanoff
3. Ironman/Tony Stark OR Loki
4. Ironman/Tony Stark
5. Thor
6. Bruce Banner
7. Sam Willson/Falcon
8. Nick Fury
9. Spiderman/Peter Parker
10. Thor
11. Black Panther/T’challa
12. Star-Lord/Peter Quill
13. Drax
14. Dr. Strange
15. Bruce Banner
16. Black Widow/ Natasha Romanoff
17. Hawkeye/Clint Barton
18. Ironman/Tony Stark
19. Ironman/Tony Stark
20. Stan Lee

AND>>>

21. Groot

(Which could not be more obvious)