Interest Stacks

A comprehensive watch order of the One Punch Man series, which includes every entry in the One Punch Man franchise.

This guide is fully maintained, retouched, reorganized and updated by yours truly.

All other published "Series Guides" by me that might interest you:
https://myanimelist.net/profile/nrhkm/stacks

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1. One Punch Man
TV - 12 x 24 minute long episodes. R - 17+ rated.
First season of the series.

1-1. One Punch Man Specials
Special - 6 x 12 minute long episodes. R - 17+ rated.
Anime-exclusive specials included in the Blu-ray and DVD releases of One Punch Man that takes place in-between the events of the first season.

1-2. One Punch Man: Road to Hero
OVA - 1 x 24 minute long episode. R - 17+ rated.
Anime-exclusive story prior to the events of the first season delivered in a "flashback", bundled with the manga's 10th volume.

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2-0. One Punch Man 2nd Season Commemorative Special
Special - 1 x 20 minute long episode. R - 17+ rated.
Recaps the events of the first season.

2. One Punch Man 2nd Season
TV - 12 x 23 minute long episodes. R - 17+ rated.
Second season of the series.

2-2. One Punch Man 2nd Season Specials
Special - 6 x 12 minute long episodes. R - 17+ rated.
Specials included in the Blu-ray and DVD releases of One Punch Man 2nd Season that takes place in-between the events of the second season.

2-3. Go! Saitama
ONA - 1 x 1 minute long episode. PG-13 rated.
Audioless comedic original short animated and released on Twitter by the manga's illustrator.

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3. One Punch Man 3
TV - ? x ? minute long episodes. R - 17+ rated.
Not yet aired. Third season of the series.

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*For those who pursue the route of watching episodes in hardcore chronological order:

1. S1 - Ep 1
2. S1 - Ep 2
3. S1 Special - Ep 1
4. S1 - Ep 3
5. S1 Special - Ep 2
6. S1 - Ep 4
7. S1 - Ep 5
8. S1 Special - Ep 3
9. S1 - Ep 6
10. S1 - Ep 7
11. S1 Special - Ep 4
12. S1 - Ep 8
13. S1 - Ep 9
14. S1 Special - Ep 5
15. S1 - Ep 10
16. S1 - Ep 11
17. S1 - Ep 12
18. S1 Special - Ep 6
19. OVA 1
20. Commemorative Special (optional)

21. S2 Special - Ep 1
22. S2 Special - Ep 2
23. S2 - Ep 1
24. S2 - Ep 2
25. S2 Special - Ep 3
26. S2 Special - Ep 4
27. S2 - Ep 3
28. S2 Special - Ep 5
29. S2 - Ep 4
30. S2 - Ep 5
31. S2 - Ep 6
32. S2 - Ep 7
33. S2 - Ep 8
34. S2 - Ep 9
35. S2 - Ep 10
36. S2 - Ep 11
37. S2 - Ep 12
38. S2 Special - Ep 6
39. ONA Short (optional)

40. S3 - TBA

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Resources used:
https://myanimelist.net/forum/?topicid=1863965
https://myanimelist.net/forum/?topicid=2017008
https://chiaki.site/?/tools/watch_order
https://wegotthiscovered.com/anime

Special thanks and credits to:
https://myanimelist.net/profile/_cjessop19_
https://myanimelist.net/profile/User-Name
https://myanimelist.net/clubs.php?cid=79626