''The Black Knight'' is a Disney comic written and drawn by Creator/DonRosa.

Duckburg is visited by Arpin Lusène, a distinguished French gentleman who is unofficially known to be ''Le Chevalier Noir'', a notorious master thief. As his final theft before retirement, he vows to steal Scrooge [=McDuck=]'s fortune as the crowning achievement of his career. After a successful heist in the Money Bin that apparently yields little of value, Lusène accidentally comes in the possession of the dangerous Universal Solvent, a substance invented by Gyro Gearloose capable of destroying anything it touches except diamond. Together with a stolen suit of armor and a bag of diamond dust, Lusène uses the Solvent to become an unstoppable BlackKnight.

In ''The Black Knight GLORPS Again!'', Lusène returns to retrieve his black suit of armor and correct the mistakes he made last time, but Scrooge himself has some new tricks up his sleeve as well.

!!Tropes used in ''The Black Knight'' and ''The Black Knight GLORPS Again!''

* BlackKnight: The Black Knight was a master thief named Arpin Lusene (better known by his criminal alias, Le Chevalier Noir), modeled after the GentlemanThief trope. He gets even worse when he actually gets a black suit of armour covered with a substance that destroys anything it touches. (He's very careful when putting it on.) After becoming [[NighInvulnerability impervious to harm]], he walks right through every one of Scrooge's defenses to steal his money.
* BriarPatching: In "The Black Knight GLOPRS Again", GentlemanThief Arpin Lusene, having made himself into TheJuggernaut by using an invention by Gyro Gearloose that can annihilate anything except diamonds, decides to frame a career-crowning impossible theft by annihilating (and pretending he stole) Scrooge [=McDuck=]'s collection of memorabilia. Scrooge begs him to at least spare the giant gold nugget that made him rich, but that only prompts him to go for it first. Which was, of course, the intention, since it's really a fake nugget in a room whose insides are covered with diamond dust, the only substance Lusene can't cut through, so he is trapped inside as surely as if he had no special equipment.
* ChekhovsGun: In "The Black Knight Glorps Again", early on in the story Gyro Gearloose carefully makes a small opening in the block of concrete that the dissolving black knight armor was kept in because it continued to destroy the air molecules around it, creating a near vacuum that they would otherwise have been sucked inside of. Later on Donald and Lusene (who's wearing the armor again) are both locked inside a containment room with Lusene threatening to dissolve Donald unless Scrooge lets him out. Donald remembers what Gyro had told him earlier and keeps the black knight distracted long enough for the oxygen in the room to run out and knock them both unconscious so Scrooge and his nephews can safely remove Lusene's armor.
* ExactlyWhatIAimedAt: Donald tries to stop the Black Knight by loading the largest diamond in the world into a cannon. It does stop him momentarily as he assumed that he could just simply walk through the cannon in his dissolving armor, but he sabotages Donald's attempt by swinging his sword to stop the ignition. Donald thinks he actually missed the fuse, but he was really aiming for the back of the cannon to redirect the blast.
* ExactWords: At the end of his first appearance, Scrooge makes Arpin Lusène (who's a GentlemanThief above all else) promise that he won't pick Donald's pockets to steal the key to escape his restraints. As soon as he's offscreen, he steals Donald's whole outfit instead.
* FunnyForeigner: Arpin Lusene, together with FunetikAksent.
-->'''Arpin Lusene''': Ah am truly ze master thif!
-->'''Donald''': "Thif"?
-->'''Arpin Lusene''': Not "thif", you iddy-ott! '''Thif!'''
* GentlemanThief: The BlackKnight, who is a rather obvious CaptainErsatz of Arsene Lupin.
* GracefulLoser: Arpin Lusène is very graceful about accepting defeat when Scrooge beats him fair and square and [[WorthyOpponent professes to relish their encounters]]. The second time, he even gifts Scrooge a rare painting to complete his collection of that artist's works. Not that it stops him from escaping every time.
* IllNeverTellYouWhatImTellingYou: Done by the title GentlemanThief in ''The Black Knight Glorps Again'', not out of stupidity, but sheer ballsiness. In his civilian persona of [[GentlemanSnarker playboy millionaire]] [[{{Expy}} Arpin Lusene]] he gives the following statement to the press:
-->'''Lusene:''' Zat would be ze greatest crime in histoire, non? But... Ah 'ave no idea what ze Black Knight plans to do... tomorrow morning at 10AM! Here! Pass zese out!\\
(''passes a written program of the caper's details'')
* {{Hypocrite}}: In "The Black Knight [=GLORPS=] Again", Scrooge stops Lusene from destroying his money by threatening to use his influence to prevent the raid from ever being published and Lusene, whose plan consisted on destroying that money to trick people into thinking he stole it, expresses anger at Scrooge's "dishonor".
* ImpactSilhouette: Done a number of times in "The Black Knight" and "The Black Knight Glorps Again", thanks to Arpin Lusene's suit of universal-solvent-coated armor. At one point Donald is blasted through a wall in a similar way by a sabotaged cannon, and Lusène notes that this trick is much easier with his suit.
* ImpossibleThief: Arpin Lusene, the Black Knight, does this all the time. No wonder, since he's an AffectionateParody of [[Literature/ArseneLupin Monsieur Lupin]] below (as well as [[GentlemanThief Gentleman Thieves]] in general). He casually steals [[SerialEscalation a man's socks while he's wearing them, the bullets from a museum guard's gun and a viking ship.]] While naked. He also stole the filament from camera's flash bulb. While the camera was in the cameraman's ''hands''. In the same story, exactly same time, he stole another reporter's ''underwear''. For context, the reporters were inquiring about Lusene's Black Knight persona, when a cameraman tries to take a picture of Lusene. [[RuleOfFunny The very next panel, Lusene is holding the filament and the other guy's underpants]] [[ButHeSoundsHandsome while denying being the Magnificent Black Knight, the world-famous master thief.]]
* ItOnlyWorksOnce: After the first time the heroes stop Lusene by PullingTheRugOut, he adds a hook to the back of the armor and it prevents the rug trick from working a second time.
* TheJuggernaut: he GentlemanThief Arpin Lusene, also known as the "Black Knight", acquires a substance invented by Gyro Gearloose called Omnisolve that instantly annihilates anything it comes in contact with other than diamonds. (In the story where it originally appeared, it was poured on the ground and ate a shaft down to the centre of the Earth.) Wanting to end his career with the ultimate [[ImpossibleThief impossible theft]], stealing all of Scrooge's money -- or at least making it disappear so people will think he did -- he coats a knight's armour and sword with diamond dust and then Omnisolve. With these, he's almost completely unstoppable, able to walk through any obstacle and absorb any attack, from cannonballs to gasses.
* KarmaHoudini: Since ''Le Chevalier Noir'' can escape from any restraints, no prison can hold him, and his true identity as a master thief has never been proven, he escapes any sort of consequences for his actions in both his appearances. However, the bitterness of this is lessened because [[GracefulLoser he's such a good sport about losing]].
* MonumentalTheft: ''Le Chevalier Noir'' (The Black Knight) is a GentlemanThief who might pull one off, now and then. At one point, he steals a whole viking ship, whilst ''completely naked''. Even he recognized the impossibility of swiping Scrooge's whole fortune, though, so he planned to disintegrate it instead. Scrooge doesn't find him as honorable as he claims to be, however, because he pulls off such heists [[{{pride}} to boost his ego]], even calling the press beforehand and telling them where to be to cover the story.
* NeverRecycleYourSchemes: Defied. In his first raid on Scrooge's Money Bin in the Black Knight armor, Lusène just walks right up to the main entrance until Scrooge disposes of him by pulling on a red carpet, causing Lusène to fall through the floor in his dissolving armor until a vault filled with diamonds breaks his fall. He recycles the scheme in his second appearance, but takes preparations to stop Scrooge's trick from working a second time by installing a hook on the back of the suit that will stop his fall.
* NighInvulnerability: Arpin Lusène, aka ''[[BlackKnight Le Chevalier Noir]]'', was the most dangerous foe Scrooge ever faced. Already a master thief, he inadvertently stole Gyro Gearloose's Universal Solvent before using it to cover a black suit of armor coated in diamond paint (the one material impervious to the solvent), making him invulnerable. He could walk through walls, shrug of having buildings thrown on top of him, and even take a bath in an acid pool by soaking it up like a sponge.
* PoliceAreUseless: At the start of the Black Knight's rampage through Duckburg, a police officer shows up to take the Black Knight in. The indestructible suit just dissolves the cuffs, and he mocks the officer by dissolving his police cruiser.
* PowerOfTheVoid: The Black Knight is always drawn pitch-black without any shading, making the impression that he's less a 3d object, but rather a silhouette, a knight-shaped ''emptiness'' in reality. Given [[SphereOfDestruction the effects]] of anything that touches the armor, it fits this trope just fine.
* PullingTheRugOut: The Ducks lay out a red carpet in front of Scrooge's money vault to celebrate an occasion. This becomes a ChekhovsGun later on when the [[BlackKnight indestructible Black Knight]] Arpin Lusene breaks into Scrooge's money bin with the intent to dissolve his entire fortune. While looking down Scrooge gets the idea to pull the carpet out from under Lusene and send him falling straight the floor inside his dissolving suit, a pile of diamonds (the one mineral unaffected by it) breaking his fall.
* RunningGag: In his two stories, people not understanding everything FrenchJerk Arpin Lusene says, particularly "mooney bean" (money bin).
* SequelHook:
** At the end of ''The Black Knight'', the nephews find Lusène's calling card in Scrooge's trophy room promising his return.
** At the end of ''The Black Knight Glorps Again!'', Lusène is last seen observing his suit of armor traveling in orbit around the Earth through a telescope.
* ShoutOut: In "The Black Knight Glorps Again!", Scrooge has pictures of himself from his Yukon days drawn by his "favorite artist". The pictures are none other than Creator/CarlBarks'. Though in some editions of the comic, the paintings are not Barks illustrations, but money-themed Creator/SalvadorDali-style paintings.
* TrophyRoom: Besides Scrooge's trophy room, Lusène himself is shown to have a sizable collection of stolen art and treasures in his French villa during the news item on him.
* WorthyOpponent: Scrooge [=McDuck=] and Arpin Lusene have a Rich Victim - GentlemanThief type of mutual respect. Lusene is a very good sport about losing, and Scrooge admits that the Frenchman is the greatest threat his fortune has (which says a lot, coming from him).