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Energon was Armada's direct sequel, and the first show since Beast Machines not to wholly reboot Transformers continuity. Energon took place ten years after the finale of Armada, at the beginning of a new age of peace on Cybertron and Earth, which was not to last long. Energon featured the return of two major villians thought vanquished at the end of Armada: Megatron and, impressively, Unicron, who, in Armada, had made his first incarnate appearance in American Transformers continuity since 1986. Energon, like Armada, was animated in Japan and dubbed for US consumption. The series employed the popular technique of combining cel-shaded computer animation with 2D cel-animation, creating a fusion between the CGI of Beast Wars/Machines and traditionally animated series such as Robots in Disguise.
Season 1
1. Cybertron City
2. Energon Stars
3. Scorponok
4. Megatron's Sword
5. The New Cybertron City
6. Megatron Resurrected
7. Megatron Raid
8. Starscream the Mysterious Mercenary
9. Battle of the Asteroid Belt
10. Energon Tower
11. The Legend of Rodimus
12. Crisis in Jungle City
13. Kicker Beware
14. Energon Grid
15. Rodimus: Friend or Foe?
16. Go For Unicron
17. The Return of Demolishor
18. A Tale of Two Heroes
19. Battle Stations
20. Alpha Q: Identity
21. Shockblast: Rampage
22. Survival Instincts
23. Each One Fights . . .
24. Unicron Unleashed
25. Open Fire!
26. Ripped Up Space
27. Team Optimus Prime
28. Protection
29. Imprisoned Inferno
30. Jungle Planet
31. Bulkhead
32. Farewell Inferno
33. Scorponok's Scars
34. Crash Course
35. Omega Supreme
36. A Heroic Battle
37. The Power
38. Optimus Supreme
39. Unicron Perishes
40. Ambition
41. Wishes
42. Galvatron
43. Breakthrough!
44. The Omega Train
Season 2
45. Decepticon Army
46. Ironhide Team
47. Formidable
48. Galvatron Terror
49. Destructive Power
50. Spark
51. The Sun