When Megatron returns more powerful than ever, the Autobots, along with their three teenaged human allies, must defeat the Decepticon menace.

1. Darkness Rising: Part 1 22m The Autobots investigate the return of the Decepticons and must account for a group of young humans who become involved in their eons-old conflict.

2. Darkness Rising: Part 2 22m When a weak life signal is received from Cliffjumper, the Autobots roll out but are met by Megatron, who has obtained powerful Dark Energon.

3. Darkness Rising: Part 3 22m Bulkhead is on a mission to rescue Agent Fowler, who has been kidnapped by the Decepticons. Complications arise when Miko secretly tags along.

4. Darkness Rising: Part 4 22m Megatron uses the Dark Energon to summon an army of undead warriors to battle Optimus, while the other Autobots launch a high-stakes rescue operation.

5. Darkness Rising: Part 5 22m The ultimate showdown unfolds in Earth's orbit as the Decepticons, aided by Megatron's undead army, do battle with the Autobots.

6. Masters and Students 22m While Optimus Prime and Bumblebee square off against Skyquake, Starscream encounters challenges to his leadership at every turn.

7. Scrapheap 22m Bulkhead, Bumblebee and Ratchet scramble to eliminate a swarm of Scraplets that have invaded Autobot base while Optimus patrols in the Arctic.

8. Con Job 22m Bulkhead eagerly anticipates a visit from his old friend Wheeljack, but when his buddy arrives things are not as they seem.

9. Convoy 22m The Autobots help Agent Fowler transport a hazardous explosive device, but this time they come under attack from more than just the Decepticons.

10. Deus Ex Machina 22m Miko and Bulkhead head to Greece on a field trip to recover an Energon Harvester, and class is in session for new Decepticons Knock Out and Breakdown.

11. Speed Metal 22m Jack convinces Bumblebee to help him win a street race, but the action speeds out of control with the arrival of Knock Out.

12. Predatory 22m Arcee takes Jack along on a seemingly routine mission, but she encounters an archenemy and must face her deepest fears.

13. Sick Mind 22m Optimus Prime becomes infected with a Decepticon plague, and Arcee and Bumblebee must sneak aboard the Decepticon warship to find the cure.

14. Out of His Head 22m Megatron remains a fixture inside Bumblebee's mind and manipulates his actions back at Autobot base.

15. Shadowzone 22m During a GroundBridge malfunction, the kids find themselves trapped inside an alternate dimension with a reanimated Skyquake.

16. Operation: Breakdown 22m The Autobots roll out to rescue Breakdown, the Decepticon who has been abducted by Silas and the sinister agents of MECH.

17. Crisscross 22m Airachnid negotiates a deal with Silas to use MECH to exact revenge against Arcee and Jack.

18. Metal Attraction 22m Arcee and Bulkhead find their efforts to stop a Decepticon mission hampered by a magnetic device.

19. Rock Bottom 22m When the Autobots, along with Jack and Miko, fall victim to an Energon mine cave-in, they find themselves trapped with Starscream and Megatron.

20. Partners 22m Airachnid and Starscream team up to retrieve a weapon, but when Starscream is captured, he reveals that he would rather team up with the Autobots.

21. T.M.I. 22m When Bulkhead's brain is accidently endowed with the secret formula for synthetic Energon, he becomes a recluse while the Decepticons hunt him down.

22. Stronger, Faster 22m Ratchet injects himself with synthetic Energon, which makes him a menace to the Decepticons, but also to the Autobots and to himself.

23. One Shall Fall 22m Megatron's attempt to fulfill an ancient Cybertronian prophecy results in a hero becoming mortally wounded, then leads to a long-awaited rematch.

24. One Shall Rise: Part 1 22m When Earth becomes plagued by natural disasters, the Autobots come to the horrible realization that Dark Energon is the source of the bizarre events.

25. One Shall Rise: Part 2 22m Facing the greatest threat to Earth yet, the Autobots team with an unexpected ally.