Timeline: 60001-70000



  • The planets of the Eternian Hegemony suffer a complete technological collapse after the electromagnetic fallout from a great war. The three worlds of the Hegemony (the homeworld Eternia and colonies of Etheria and Enduria) lose all ability to travel between worlds.1


  • Births: Hordak (February 29)


  • A slave ship in orbit of the planet Enduria undergoes a rebellion of its slaves and crew, led by the Cat Leo. Leo forges the Sword of Omens in fighting the tyrannical Mumm-Ra. The ship crashes to the planet's surface, and the different types of animal humanoids spread out on the planet. Leo and his mate Panthera found the Kingdom of Thundera.2


  • The Doctor (fifth incarnation), Nyssa (40), and Tegan Jovanka (23) visit the Sirius Archipelago, following a signal. Their arrival coincides with an attempt to take over the society there by an official, himself manipulated by the race of android servants. The system of perpetual war is exposed, and the society begins reformations.3



  • Births: Orko (June 8)


  • Births: Jaga (July 10)







  • Thunderan warrior Panthro (18) meets Grune on the field of battle against the forces of the Lizards. The two are fast friends. They prove their mettle by helping save King Claudus.4



  • Births: Tygra (June 29)


Keldor (30) and a band of goons attempt to overthrow the Eternian royal family. Ultimately unsuccessful, Keldor attempts to slay his half-brother with acid, but the attack is deflected and hits Keldor in the face.[5] After retreating, Evil-Lyn brings the dying Keldor before his master Hordak (6531), who saves his life, but leaves his face as resembling a fleshless skull.


  • May 26. Teela Na (27) gives birth to a daughter she names Teela. Knowing that she cannot raise the child while keeping her duty to protect the secrets of Castle Grayskull, she gives the child over to the girl's father (who is unaware he is such) Duncan (30).


  • February 17. Eternian Queen Marlena and King Randor's twin children, Adam and Adora, are born.
  • May 19. Hordak (6533) and his Evil Horde, including Skeletor (32), make an assault on Eternos. Hordak and Skeletor slip away from the main force to attempt to abduct the infant children of the king. Hordak seizes Adora, but Duncan (31) interferes in time to stop the abduction of Adam. Skeletor is captured, but Hordak escapes extra-dimensionally with Adora.5
  • August 5. Lion-O, son of King Claudus of Thundera, is born. His mother dies in childbirth.



King Claudus, after instead promoting Lynx-O to command of the Army, sends his generals Grune and Panthro (34) off on a quest to find the fabled Book of Omens.[7]
Young warrior Cheetara (14) attempts to join Jaga's clerical order. She fails her initial test of character, but remains for several days at the temple, showing her resilience. She makes it through the time with the moral support of a young guard, Tygra (13). Jaga eventually accepts Cheetara into his ranks.



May. The Trollan Orko (1436) emerges from a mystical maelstrom on the planet Eternia. Weakened by the loss of his focusing wand, he makes his way to Eternos and joins the court of King Randor.


December. Grune and Panthro (39) come across the tomb of Mumm-Ra, after Mumm-Ra telepathically influences the angry and frustrated Grune. Grune frees Mumm-Ra and betrays Panthro, throwing Panthro in a pit that he barely survives.[8]


August 29. While researching technology, Thunderan prince Lion-O (16) meets cleric Cheetara (19), who helps him fend off angry criminals. After a ceremony presenting the Sword of Omens to Lion-O, King Claudus's old friend General Grune appears with a lizard slave-led wheeled obelisk. Lion-O has some rivalry with his adoptive brother Tygra (19), and later, after defending a pair of Lizard men held in the stocks, he convinces his father to have them released.[9]
August 30. A Lizard invasion force moves against Thundera. Their advanced technology, coupled with the betrayal of Grune (whose obelisk carries the Lizard general Slithe and a horde of soldiers), results in the swift conquest and near annihilation of the Thunderan people. King Claudus dies after Mumm-Ra disguises himself as Claudus's old friend Panthro, and stabs him in the back. Lion-O, Tygra, Cheetara, and High Priest Jaga (70) are all taken captive. Lynx-O, Pumyra, and Bengali are amongst those who escape otherwise.[10]
August 31. Lion-O and Tygra escape their confinement due to the help of the Lizard Lion-O had pardoned prior. They confront Mumm-Ra and seize the Sword of Omens, escaping alongside Cheetara. Jaga, wounded in the battle, is captured by Mumm-Ra and tortured to get information on the location of the Book of Omens.[11]
September 1. After placing King Claudus's body in a funeral pyre, Lion-O, Cheetara, Tygra, and Lion-O's nursemaid Snarf (38) leave Thundera. Just outside the border, they run into a pair of street urchins in WilyKit and WilyKat, who unofficially join their little group.[12]
September 12. The Thundercats find themselves in a huge briar thicket. They befriend the plant-like Petalars, who live their entire lives in a day. They help the Petalars leave the thicket to carry themselves on the winds to their ancestral homelands. In the aftermath, the Thundercats face Slithe and his Lizards, and are nearly routed due to sheer numbers, but a surviving Panthro (39) arrives in his Thundertank, causing Slithe to retreat.[13]
September 13. The Thundercats infiltrate a mountain being mined by Mumm-Ra's war effort in search of thundrillium fuel for the Thundertank. Panthro has a brief confrontation with Grune. Lion-O earns Panthro's respect.[14]
September 16. The Thundercats reach the Tower of Omens after defeating several deadly obstacles. Mumm-Ra attacks, and nearly slays them, but Jaga, a spirit trapped in an orb by Mumm-Ra, sacrifices himself to stop Mumm-Ra, exploding in a burst of light. Lion-O recovers the Book of Omens.[15]


September 9-11. After getting a vision of the abduction of Adora from nearly 18 years earlier, the Sorceress Teela Na (46) of Castle Grayskull summons Prince Adam (18) and Cringer (6). Taking with them a nearly identical sword, they seek the answer to the sword's mysterious leading behavior. Passing through a portal, they leave Eternia and appear on Etheria. Adam and Cringer are immediately drawn into the Kingdom of Bright Moon's rebellion against the Evil Horde, necessitating their transformation into He-Man and Battle Cat. This leads them to confrontation with Force Captain Despara (18), who manages to defeat He-Man when the twin sword reacts to her presence. A captured He-Man convinces Despara to investigate the true nature of Hordak (6551) and his Evil Horde as evil. Despara learns of the cruelty of the Evil Horde, but Hordak's ally Shadow Weaver suppresses Despara's cognition. Eventually, through contact with the Sorceress, Despara, realizing her identity as Adora, takes command of her Sword of Power, and instinctively transforms into She-Ra. Her addled mind is liberated, and she frees He-Man, revealing their relationship as twin siblings. Her horse, Spirit, transforms into Swift Wind. They proceed to rescue Bright Moon Queen Angella, and then depart for Eternia.[16]
September 12-13. Adam brings Adora to his parents Marlena and Randor, who are happy to reunite with their daughter. Hordak, having followed the heroes to Eternia, teams up with Skeletor (50) and his associates to capture Adora, and are successful. Skeletor betrays Hordak, sending him back to Etheria. Although He-Man, Battle Cat, Man-at-Arms (49), and Teela (19) make an effort to rescue her, Adora escapes and, as She-Ra, defeats Skeletor and his goons.[17]
September 14. Adora decides to return to Etheria to liberate it completely from Hordak and his Horde.[18]


October 5. The Ancient Spirits of Evil send Mumm-Ra on a quest after they cause a spatial rift that draws Third Earth into close proximity to Eternia. Mumm-Ra disguises himself as the Sorceress, and tricks Prince Adam (19), stabbing him through the heart with the Sword of Power. Though dying, Adam uses the Sword to transform into He-Man, and battles Mumm-Ra, but Mumm-Ra escapes with the Sword. The Spirits betray Mumm-Ra, turning him to dust, and allowing Skeletor (51) to take the Sword. While He-Man and the Masters (including Man-at-Arms [50], Teela [20], and Orko [1544]) battle a combined team of Skeletor's goons (Beast Man, Tri-Clops, Trap Jaw, and Evil-Lyn) and Mumm-Ra's (Slithe, Atticus Monkian, Kaynar Jackalman, and Vultaire Vultureman), Skeletor casts a spell and consumes Mumm-Ra's remains, absorbing his power, and allowing him full access to the Sword of Power's might. At the same time, He-Man reverts to his true Adam form, and dies in his father's arms. A triumphant Skeletor, who finds the essence of Mumm-Ra attached to his consciousness, is immediately attacked by Lion-O (19) and the Thundercats (Panthro [42], Cheetara [22], Tygra [22], WilyKit [13], WilyKat [13], and Snarf [39]). Skeletor is a match for them all, but as a group they begin to overwhelm him. Skeletor slashes Lion-O across his left eye with the Sword of Power, leaving a great scar and damaging his eye. Finally, Lion-O uses Skeletor's reflection (a weakness of Mumm-Ra's) in the Sword of Omens to cause him to flee without the Sword of Power. [19]
October 6. The Eternian people gather for the funeral of Prince Adam. The Thundercats come to Eternos, and bring the Sword of Power, and Lion-O presents it to King Randor. Suddenly, the Ancient Spirits of Evil, under the command of a united Skeletor and Mumm-Ra, attack Eternos. While the Eternians and Thundercats work together at evacuation efforts, Lion-O and Cringer (7) take Adam's corpse to Third Earth in a mad attempt to revive him. Cringer, transformed temporarily into a Battle Cat humanoid by the Sword of Omens, fights and defeats Atticus, Kaynar, Beast Man, and Tri-Clops, while Lion-O places Adam in Mumm-Ra's sarcophagus. Adam revives as a berserk He-Man, and Lion-O battles him to a standstill. He restores He-Man's mind with the Sword of Omens. The Ancient Spirits approach Castle Grayskull, and the defenders engage them. With their combined forces, and the help of the Sorceress (47), the four giant demon monsters are defeated. Skeletor and Mumm-Ra then merge (becoming "Mumm-ator") and defeating both groups. Lion-O, He-Man, and Battle Cat return to Eternia, and storm Castle Grayskull, which has already been invaded. Mumm-ator subdues the Sorceress, and begins to access the Orb of Power, but the combined efforts of Lion-O and He-Man brings about the defeat and separation of the villains.[20]



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5^ Events of He-Man and the Masters of the Universe episode "The Beginning" (2002).
7^ Events of flashback in Thundercats episode "Old Friends" (2011).
8^ Events of flashback in Thundercats episode "Old Friends" (2011).
9^ Events of Thundercats pilot episode "Omens" (2011).
10^ Ibid.
11^ Ibid.
12^ Events of Thundercats episode "Remlak Rising" (2011).
13^ Events of Thundercats episode "Song of the Petalars" (2011).
14^ Events of Thundercats episode "Old Friends" (2011).
15^ Events of Thundercats episode "Journey to the Tower of Omens" (2011).
16^ Events of She-Ra: Princess of Power debut miniseries "The Sword of She-Ra" (1985). The Despara name comes from the He-Man and the Masters of the Universe comic book series (2013).
17^ Ibid.
18^ Ibid.
19^ Events of He-Man/Thundercats #1-3 (2016-2017).
20^ Events of He-Man/Thundercats #3-6 (2017).

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