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Gandalf is one of the great heroes of "The Lord of the Rings," both the books and movies. But that doesn't mean he isn't capable of making some bad mistakes.

Spider-Man likes to blame all the bad things that happen to him on "the old Parker luck." We have a better name for it: karma.

"The Super Mario Bros. Super Show!" endures in pop culture as a cheesy yet fun piece of '80s nostalgia. Here's where you can stream It these days.

Nightwing, or Dick Grayson, has done some questionable things over the years. Here are the most terrible things he's ever done.

The Wasp has quite the sting. Discover the worst things Marvel's tiniest heroine has done throughout her giant-sized career.

Peter Quill's crew has saved the galaxy, but their record isn't exactly clean. Here are the most terrible things "The Guardians Of The Galaxy" have ever done.

Though "Back to the Future" is a beloved classic, and we root for Marty, he's made some questionable decisions over the years.

He's definitely a hero, but the Sorcerer Supreme is known for lapses into moral ambiguity. These are the most terrible things Doctor Strange has ever done.

Back to the Future's Doc Brown may be a genius, but he has a shaky moral compass and can be remarkably self-serving and hypocritical. Here's proof.

We may cheer on Captain Jack Sparrow, but even a cursory glance makes it clear that he's a terrible person. Here's his worst actions.

Wolverine may be part of one of the most famous superhero teams in history, but being an X-Man doesn't always make him a good guy.

From the toy store to the daycare center, Buzz Lightyear's do-good attitude hasn't always resulted in the best outcome for those around him. In fact, he's done some pretty terrible things.

Toy Story's Woody is a leader and a hero, but he's got a dark side. Here are the most terrible things Woody has ever done. Watch out, you won't see them coming.

The Hulk is more of a living wrecking ball than a real superhero, and here's the awful proof.

Thor is loud, brash, cocky, reckless, and violent—and that's when he's a good guy. When he goes bad, he's even worse.

There's a difference between charmingly eccentric and outright crazy, and every now and then, Batman crosses the line.

Venom's path to stardom has been paved with horrible acts so horrendous that literally eating someone's brain isn't even close to being the worst.

Taking into account both the comics and the TV series, here are some of the worst things the Umbrella Academy has ever done.

From trying to kill Mace Windu to betraying Luke Skywalker, here are the most terrible things that Boba Fett has ever done.

With friends like these, who needs enemies?

These are some of the most terrible things Homer Simpson has ever done.

While most would-be heroes would do anything to improve their rep, the most lovable rogue in the Rebel Alliance revels in his bad reputation.

Harrison Ford excels at playing lovable rogues, but when you get down to it, Indiana Jones is much more "rogue" than "lovable."

For some people, James Bond is a role model. If that describes you, reevaluate your priorities.

Harry Potter is, of course, the hero of the Harry Potter series, but he's hardly a white knight.

The cartoon duo's bad behavior has ranged from ranged from irresponsible to inhumane to... well, genocidal.

Luke Skywalker means well, but he's proven time and time again he's just not ready for the limelight.

We all make mistakes, even the guy with the red, white and blue shield and Super-Soldier Serum coursing through his veins.

If we mess up, it might ruin our day. If Wonder Woman does, then it's a complete and utter disaster.

Most of Marvel's superheroes have done some questionable things, but Black Widow's past is particularly colorful. Here's a look at some of her worst deeds.