The inhabitants of the planet Thundera evacuate just before it is destroyed. They were pursued by a band of mutants. All but one of their escape ships was destroyed. Only a small group of Thunderans (Thundercats) remained. With only half engine power, the group, which was led by Jaga, had to set a course for the nearest planet. Jaga commanded their ship while the other seven were in their stasis tubes. Jaga died on their journey to Third Earth and their ship crashed there. Soon they made friends with various groups in the area and they designed a fortress. Mumm-Ra the centuries-old embodiment of evil, along with the mutants that destroyed the rest of the Thunderans are a constant threat. But Lion-O, the new leader of the Thundercats, with his weapon the "Sword of Omens" will help the Thundercats to have a standing chance.
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| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | The Sword of Omens (1) | 2011-07-29 | 30 min |
| Season 1 | Episode 2 | Ancient Spirits of Evil (2) | 2011-07-29 | 30 min |
| Season 1 | Episode 3 | Ramlak Rising | 2011-08-05 | 30 min |
| Season 1 | Episode 4 | Song of the Petalars | 2011-08-12 | 30 min |
| Season 1 | Episode 5 | Old Friends | 2011-08-19 | 30 min |
| Season 1 | Episode 6 | Journey to the Tower of Omens | 2011-08-26 | 30 min |
| Season 1 | Episode 7 | Legacy | 2011-09-02 | 30 min |
| Season 1 | Episode 8 | The Duelist and the Drifter | 2011-09-09 | 30 min |
| Season 1 | Episode 9 | Berbils | 2011-10-28 | 30 min |
| Season 1 | Episode 10 | Sight Beyond Sight | 2011-11-04 | 30 min |
| Season 1 | Episode 11 | The Forest of Magi Oar | 2011-11-11 | 30 min |
| Season 1 | Episode 12 | Into the Astral Plane | 2011-11-18 | 30 min |
| Season 1 | Episode 13 | Between Brothers | 2011-11-25 | 30 min |
| Season 1 | Episode 14 | New Alliances | 2012-03-24 | 30 min |
| Season 1 | Episode 15 | Trials of Lion-O, Part One | 2012-03-31 | 30 min |
| Season 1 | Episode 16 | Trials of Lion-O, Part Two | 2012-04-07 | 30 min |
| Season 1 | Episode 17 | Native Son | 2012-04-14 | 30 min |
| Season 1 | Episode 18 | Survival of the Fittest | 2012-04-21 | 30 min |
| Season 1 | Episode 19 | The Pit | 2012-04-28 | 30 min |
| Season 1 | Episode 20 | Curse of Ratilla | 2012-05-05 | 30 min |
| Season 1 | Episode 21 | Birth of the Blades | 2012-05-12 | 30 min |
| Season 1 | Episode 22 | The Forever Bag | 2012-05-19 | 30 min |
| Season 1 | Episode 23 | Recipe for Disaster | 2012-05-26 | 30 min |
| Season 1 | Episode 24 | The Soul Sever | 2012-06-02 | 30 min |
| Season 1 | Episode 25 | What Lies Above, Part 1 | 2012-06-09 | 30 min |
| Season 1 | Episode 26 | What Lies Above, Part 2 | 2012-06-16 | 30 min |
| Production | Jules Bass | Executive Producer |
| Sound | Bernard Hoffer | Music |
| Production | Arthur Rankin, Jr. | Executive Producer |
| Visual Effects | Tsuguyuki Kubo | Character Designer |
| Visual Effects | Minoru Nishida | Character Designer |
| Production | Masaki Îzuka | Executive In Charge Of Production |
