The video discusses 8 heroes from various video games who became villains. These heroes include:
1. Mario, who kidnapped Donkey Kong in the game "Donkey Kong Junior".
2. Talion, the protagonist of "Middle-earth: Shadow of Mordor", who becomes corrupted by the power of Sauron.
3. Big Boss, the protagonist of the "Metal Gear" series, who becomes a villain after being betrayed and corrupted by the Patriots.
4. Cormac, the protagonist of "Assassin's Creed: Rogue", who betrays the Brotherhood and becomes a Templar.
5. Superman, who is manipulated by the Joker in the game "Injustice: Gods Among Us" and becomes a villain.
6. Liu Kang, the protagonist of the "Mortal Kombat" series, who is resurrected and becomes a villain in "Mortal Kombat 11".
7. Jill Valentine, a protagonist from the "Resident Evil" series, who is brainwashed by Albert Wesker and becomes a villain.
8. Gabriel Belmont, the protagonist of "Castlevania: Lords of Shadow", who becomes Dracula at the end of the game.
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Here are the key facts extracted from the text:
1. Mario was a villain in the 1980s game Donkey Kong Junior.
2. In Donkey Kong Junior, Mario kidnapped and arrested King Kong.
3. Talion, the protagonist of Middle-earth: Shadow of Mordor, becomes a villain in the game's sequel, Middle-earth: Shadow of War.
4. The Big Boss from the Metal Gear series becomes corrupted and becomes the main villain of the 1987 game Metal Gear.
5. The Assassin's Creed franchise shows that the difference between the Templars and the Assassins is smaller than imagined.
6. Shay Cormac, the protagonist of Assassin's Creed Rogue, betrays the Brotherhood and becomes a hunter of his former allies.
7. Superman was manipulated by the Joker in a comic book storyline and ended up killing his wife and unborn child.
8. Liu Kang, a hero from the Mortal Kombat series, was resurrected by a necromancer and became a villain.
9. Jill Valentine, a protagonist from the Resident Evil series, was brainwashed by Albert Wesker and became a villain.
10. Gabriel Belmont, the protagonist of Castlevania: Lords of Shadow, becomes Dracula at the end of the game.
Note that these facts are based on the text and may not be accurate or up-to-date representations of the respective games or franchises.