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Written by Peter Lawrence


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The story of Excalibur, the greatest sword in history, is revealed to MUMM-RA. MUMM-RA determines to obtain Excalibur and to defeat LION-O and the Sword of Omens. MUMM-RA transforms himself into King Arthur and summons the Lady of the Lake. MUMM-RA goes to the Cats’ Lair and at first succeeds in persuading the THUNDERCATS that he is a most powerful and honorable knight. The THUNDERCATS become suspicious of MUMM-RA/King Arthur because of his un-knightly behavior and arrogance. MUMM-RA/King Arthur taunts LION-O and maneuvers him into a joust. Excalibur and the Sword of Omens rip themselves free of their combatants and fight independently. But, having defeated the Sword of Omens, Excalibur refuses to obey the evil MUMM-RA/King Arthur. Merlin appears and entrusts Excalibur to LION-O, who returns it to the Lady of the Lake.


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Lion-O and the ThunderCats learn that the Code of Thundera that they live by is shared by others and is part of a universal moral code. They are introduced to Merlin, caretaker of Excalibur, and to the legend of King Arthur and his code of justice, truth, honor, and loyalty. And they learn, after witnessing the futile attempt of Mumm-Ra to subvert the code for evil purposes, that true morality in its highest form is an end in itself and rests on universal moral principles. Any attempt to subvert it or ignore it, as in the foolish duel of Mumm-Ra and Lion-O, is doomed to failure.

One theory of moral development holds that moral judgment proceeds through levels from the avoidance of punishment, to social conformity, to an autonomous and internalized set of values (Kohlberg, 1963). An important distinction to make in considering moral behavior is between general moral principles and social conventions. Children, as early as between the ages of 4 and 6, have the ability to distinguish moral issues, based on principles like justice, fairness, and the welfare of others, from social conventions, arbitrary rules of conduct sanctioned by custom and tradition, like types of clothing or using first names or titles in addressing people (Turiel, 1983). Helping children make such distinctions is an important part of fostering their moral development.

KOHLBERG, L. (1963). The Development of Children’s Orientation Toward a Moral Order: I. Sequence in the Development of Moral Thought. Vita Humana, 6, 11–33.
TURIEL, E. (1983). The Development of Social and Moral Knowledge: Morality and Convention. Cambridge: Cambridge University Press.

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From the very outset of the ThunderCats series, Lion-O’s iconic weapon, the Sword of Omens, was made a central feature. The source of the ThunderCats’ power and their mightiest weapon in defense of themselves and their friends, the Sword at times seemed almost invincible, and so it was natural that one theme the writers of the series would wish to explore was finding a force or weapon that could match the Sword in battle. One such attempt was “The Thunder-Cutter”, named after Hachiman’s sword of the same name. “Excalibur” is another in the same vein and, it has to be said, one of the more successful exploits into this territory.

The concept of pitting the Sword of Omens against not another sword from within the ThunderCats canon but instead a sword from ancient legend is an inspired one. Not only is Excalibur regarded throughout fiction as one of the mightiest swords ever to exist, but, because of that, its very name conjures up a formidable image of a sword that few could hope to better. Another notable thing about the use of Excalibur in this episode is the fact that it creates one of the series’ strongest-ever links between Third Earth and our Earth. Whilst the legend of King Arthur is predominantly fictional, it is nonetheless a fiction that pertains directly to our Earth—yet another indication that Third Earth and our planet are one and the same, merely at different stages of the planet’s evolution.

This episode is noteworthy for showcasing how central the Sword of Omens is to all of the series’ main characters. The most obvious example of this is that it is the source of the ThunderCats’ powers, as is demonstrated when the Eye of Thundera is (briefly) destroyed, stabbed by Excalibur, and the ThunderCats are robbed of their strength and powers. However, this episode also displays how much of an effect the presence of the Sword has had on Mumm-Ra himself. In the early stages of the ThunderCats series, Mumm-Ra is shown to covet the power of the Eye of Thundera, and his primary goal is to possess the Eye’s power for himself. After discovering in “The Garden of Delights” that he lacks the ability to warp the Eye’s power to his own evil ends, he gradually seems to fixate more on destroying it (and the ThunderCats) rather than possessing it. In this way, the concept of both the ThunderCats’ and the Eye’s presence on Third Earth seems to become more of an irrational obsession for Mumm-Ra, with seemingly his every deed being performed in the hope of destroying his enemies. This fact would be borne out in the show’s fourth season when the ThunderCats leave Third Earth for New Thundera – rather than returning to his home planet of Third Earth to try and conquer it in the ThunderCats’ absence, Mumm-Ra instead journeys to New Thundera and attempts to conquer that instead, thus indicating an obsession with defeating the feline heroes above all else. The very germ of that concept is actually evident with Mumm-Ra’s rant at the start of this episode, which lacks form but instead comes over as the lunatic ravings of a madman hell-bent on destruction and revenge.

This episode is also a notable one for Lion-O, whose character is cleverly exploited here by writer Peter Lawrence. In the series’ earliest offerings, Lion-O is shown to be a very flawed character, displaying a sense of lion-like pride that lands him in many difficult situations and is counter-productive to his effectiveness as a warrior and leader. Whilst Lion-O’s actions in this episode don’t hearken back to quite that early level of immaturity, Mumm-Ra, disguised as King Arthur, knows exactly the right ThunderCat to goad with his insults, taunts, and generally discourteous manner. That Lion-O should react in the manner that he does ironically brings to mind another sword-based episode, the aforementioned “The Thunder-Cutter”, in which Hachiman’s somewhat overbearing behavior brings out the indignant, youthful pride of the young Lord of the ThunderCats.

One thing that is interesting about Lion-O’s behavior in this episode is that one would expect the other ThunderCats to try and temper their young leader’s prideful actions with rationality and wisdom. Instead, Tygra and Panthro seem to be almost in favor of it, insisting that Lion-O has no choice and refusing to intervene in his duel with King Arthur (Mumm-Ra) on the grounds that it’s a matter of honor. Only Cheetara sees the futility of Lion-O’s conflict with the insane knight. It’s surprising that the other two elder ThunderCats would take the stance they do, perhaps indicating that King Arthur’s (Mumm-Ra’s) taunts got to them as well.

This episode is beautifully animated at times, with some incredible, almost cinematic, direction. The flashback of Arthur drawing the sword from the stone is accompanied by some prismatic sunlight and a lovely pan of the crowd, out of focus in the background, as well as some inspired transitions. Lion-O’s last-minute appearance on his unicorn is made all the more dramatic through a triple punch-in and a soft glow, as if there were Vaseline on the camera lens. The most dramatic effect, though, comes at the end of Act 1 and mid-joust in Act 2, when all motion is frozen and the whole image takes on the look of a painting. These small touches really help to establish this episode as one filled with suspense and drama. There are very few ThunderCats episodes with as dark and foreboding a feel as this one has, a sense that is emphasized by the fact that, in the end, the ThunderCats enjoy a lucky escape rather than a victory, with Merlin’s timely intervention the only thing that saves them from certain destruction.

Perhaps because of this foreboding sense, perhaps because of the plot, or perhaps because of the guest characters that link Third Earth so strongly to our Earth, “Excalibur” is a very powerful and memorable episode and one of the standout episodes of ThunderCats‘ first season.

Written by Chris (He-Fan)


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Notes of Interest button The flashback at the start of this episode shown clips from the episodes “Queen of 8 Legs”, “Return to Thundera” and “The Astral Prison”.
Notes of Interest button The Ancient Spirits of Evil are voiced in this episode by Earl Hammond, whereas they’d later be voiced by Earle Hyman.
Notes of Interest button When Excalibur stabs the Eye of Thundera, the ThunderCats lose their strength and collapse, reiterating the oft-stated fact that the Eye is the source of their powers. Their insignias also go dark, something we later see “The Thunderscope” when the Eye is again damaged and Lion-O is nearly killed.
Notes of Interest button Another consequence of the Eye being damaged relates to the Cats’ Lair. The lights go out, and the exterior insignia also fades. While this is probably just for dramatic effect, it does imply some sort of connection between the Eye and the thundrillium that powers the Lair.
Notes of Interest button Many popular hallmarks from the various versions of Arthur’s story appear as part of the Ancient Spirits’ retelling of the history of Excalibur, from relatively well-known elements such as Merlin the Magician and the Lady of the Lake, through to Sir Bedivere, the Knight of the Round Table who returns Excalibur to the Lady of the Lake.


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