Moral Event Horizon
Once he crosses that red line, there's no turning back.

"Tarkin, if ever there was a shred of humanity in you or these twisted creatures of yours, it's dead now. You're at war with life itself."
Princess Leia Organa (after Grand Moff Tarkin wipes out her home planet), Star Wars Radio Dramas

Named for the boundary around a black hole from which there is no escape once crossed, this trope uses the black hole as a metaphor for evil; the Moral Event Horizon refers to the first evil deed to prove a particular character to be irredeemably evil.

Note the word irredeemably. It is a demonstration of permanent evil; as in, the first evil deed whose role in the story is to tell us they will always be a bad person. That moment where you know for sure that it is simply not possible for them to wash their hands to get rid of the damned spot of blood. The moment any Freudian Excuse they may have loses all meaning. And of course, many villains stay evil throughout, but we're talking "If you can find it in your soul to even consider forgiving this person, there's something freakishly wrong with you." Their existence is a blight on humanity. They. Are. Vile.

While they may not have had a term such as this to define it, many authors clearly recognized it. Robert A. Heinlein's Stranger in a Strange Land referred to it as being the result of an act that was "so bad, so black" that it was basically unforgivable. Meanwhile, multiple religions have the concept of "perdition", where those who have committed a truly unpardonable sin are irrevocably doomed to punishment in the afterlife.

Obviously, it follows from the definition that a character can't cross this boundary more than once. Crossing it implies going from redeemable to irredeemable, and that's it; the other way around contradicts the definition. Of course, that doesn't mean they'll always be getting worse. Sometimes a character who has crossed the horizon will invoke I've Come Too Far afterwards... but they have still crossed the line. Yet there are ways to stem the descent into a true monstrosity. Sometimes all that stands between man and monster is a Single Tear... or even a full-out weep. Perhaps a show of respect for the enemy. A Heel Realization that you've gone too far. Sometimes they become The Atoner. But the act has been committed, and they will never fully succeed....

And since it's subjective, some characters will think you've crossed it, while others may be still prepared to believe in your possible redemption.

Just as with a real black hole, the closer you come to a Moral Event Horizon, the harder you must try to escape.

A Complete Monster lives on the other side of the Moral Event Horizon, but crossing the Moral Event Horizon does not automatically imply that the crosser is a monster. The character can just be a bad person (and maybe even somewhat sympathetic); the Moral Event Horizon is a black mark in their history that can never be forgiven. A character who performs an act that should make them irredeemable but somehow gets away with it is a Karma Houdini. Unless they realize it, feel horrible, and work their ass off to atone for that crossing. Then maybe it'll evolve into Forgiven, but Not Forgotten; that one crossing certainly will stay as a black mark, but they're working to be a better person. Such instances, however, are rare.

Sometimes, however, there is a positive usage of a Moral Event Horizon. If, in a work, a villain seems to be too ineffectual and pathetic to be a threat, yet the show wants to insist that it's a dangerous villain, letting the villain cross the Moral Event Horizon can be a good way to establish that villain's caliber, that he's meant to be opposed and taken seriously. In other words, it can save a supposed villain from being a failure of a villain.

When a hero crosses a Moral Event Horizon and it becomes questionable whether they can still be qualified as a hero, this is Designated Hero.

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    Comic Strips 
  • Crankshaft. The September 2013 plot arc has Crankshaft get even surlier than usual because a new co-worker is challenging his reign of smug, curmudgeonly idiot incompetence; his response is to try to 'scare' her into letting him be the festering asshole using his hard life as an excuse to be the antisocial clod he was born to be... by trying to run her over with his school bus.

    Pro Wrestling 
  • While deaths in the ring are not unheard of, they are extremely rare. So when Ox Baker killed Alberto Torres with his heart punch, that wasn't when he crossed the horizon. It was when he bragged about the death and tried to cause more with intentional heart punches that he crossed the line. And he was hated everywhere.
  • Big Boss Man crossed it by killing Al Snow's dog and feeding it to him, mocking the Big Show's father's death, and stealing his father's corpse at the funeral.
  • Colt Cabana crossed the event horizon in IWA Mid-South when he tried to rape Chris Hero's student, Nadia Nyce. In fact, some of his fans declare his IWA M-S run a Dork Age solely because of this incident or just choose to ignore that he was ever there.
  • Jimmy Jacobs crossed the event horizon in the Independent Wrestling Association, or at least IWA Mid-south, when he appeared in rival promotion All American Wrestling and threw the IWA M-S Heavyweight Title belt in the trash. He's since shown up in IWA M-S again, in defiance of his permanent ban but is always the bad guy. He was considered a hero in AAW though, at least initially. He also crossed it in Ring of Honor when he tried to impale his ex-girlfriend the Lovely Lacey with a railroad spike, as even stablemates Tyler Blacknote  and Joey Matthews felt he was going over the line.
  • Brock Lesnar either crossed it when he pushed an injured Zach Gowen down the stairs, or when he assaulted Shawn Michaels and broke his arm.
  • Portia Perez crossed the event horizon when she tried to kill Allison Danger's unborn child. While she had masked babyface runs prior she was never really forgiven and retired in SHIMMER with no real friends, besides maybe Matthews.
  • Seth Rollins crossed it when he took a retired Edge hostage and attempted to Neck Snap him even after John Cena gave in to his demands.
  • Jonathan Coachman crossed it during his Disproportionate Retribution phase against John Cena and his father — an elderly non-wrestler, by the way — for invoking admittedly Necessary Evil extremes against Randy Orton for repeatedly terrorizing them at the time.
  • Randy Orton once mocked Rey Mysterio Jr. by claiming that the recently deceased Eddie Guerrero (one of Rey's best friends) was in Hell.
  • Michael Cole mocking the death of Jerry Lawler's mother.