From backstabbing allies to selling out countries, history is filled with shocking acts of treachery. Join us as we explore the most devastating betrayals that changed the course of history! Our countdown includes those who betrayed their nations, leaders who turned on their people, and individuals who sold secrets to enemies for personal gain.

How could they? Welcome to WatchMojo, and today we’re counting down our picks for the most unexpected, heart-wrenching betrayals in movies we couldn’t have seen coming. Warning: There will be some pretty twisted spoilers coming up!

The betrayals are back! Join Ashley as we look over the times in anime where characters revealed their sinister true colors

We're still not over these sitcom betrayals. Welcome to MsMojo, and today we’re counting down our picks for the times when sitcom characters got the soap opera treatment, and had to endure some brutal backstabs.

Reality shows are full of shocking betrayals. For this list, we’ll be looking at the wildest tales of deception from our favorite unscripted reality series.

These rom-com betrayals are beyond unforgivable. For this list, we’ll be looking at the biggest, most painful stabs in the back from the romantic comedy canon.

These teen movie betrayals continue to shock us. For this list, we’ll be looking at the most appalling and unforgivable acts of deception or treachery in our favorite teen films.

These teen drama betrayals still sting. For this list, we’ll be looking at the most dramatic and unforgivable betrayals from some of our favorite teen shows.

With betrayals this frequently shocking, we don't know how you could trust anyone on “The Boys.” For this list, we’ll be looking at the gasp-worthy backstabs and double-crosses across the course of this vulgar Amazon series. Naturally, super-sized spoilers lie ahead.

"The Sopranos" is a thrilling show packed with surprising betrayals. For this list, we’ll be looking at the most shocking moments of treachery and double-dealing on HBO’s crime drama series. Because we’ll be discussing major plot points, a spoiler warning is in effect.

The biggest betrayals on “The 100” got messy. For this list, we’ll be looking at the double-crosses and reversed loyalties that left us speechless.

There are backstabbers, and then there are these guys. For this list, we'll be counting down the top 10 betrayals in Video Games... AGAIN! We'll be looking at another set of allies in video games who delved into deception, dishonesty and trickery, often at the expense of the player character.

These betrayals rocked our worlds. Welcome to WatchMojo.com and today we’ll be counting down our picks for the Top 10 Biggest TV Show betrayals. For this list, we’ll be looking at the treacherous small screen events and characters that were the most surprising and/or impactful. Because many of these betrayals are important the plots of their respective series, note that there will be spoilers ahead.

Another Top 10 Anime betrayals

When you play the game of thrones, you win or you die… or live long enough to see your allies turn on you. Welcome to WatchMojo.com, and today we’re counting down our picks for the top 10 betrayals on “Game of Thrones.” For this list, we’re looking at the most shocking backstabs from the first six seasons of this jaw dropping fantasy drama. This list is dark and full of spoilers; so a SPOILER ALERT is now in effect. If you’re not caught up, neither the old gods nor the new can help you. You have been warned.