Disney's "Lilo and Stitch" was released in 2002, but most of the animation was completed before the 9/11 terrorist attacks in 2001.

The original story included Stitch and pals hijacking an airplane to try and save Lilo, and the plane crashed through buildings in a busy city.

After 9/11, Disney changed this sequence so the airplane was an alien ship which crashes into mountains instead of buildings.

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Movie studios often make changes to films in order to market them differently, but in the case of Disney's 2002 animated movie "Lilo and Stitch," an entire sequence was reanimated after the shocking terrorist attacks of September 11, 2001.

"Lilo and Stitch" culminates with an air chase between two alien spaceships as Stitch and company try to save Lilo. But in the original script and animation, one of the aircrafts was a 747 commercial airliner that crashed into multiple buildings during the scene.

Read more: 13 movies and TV shows that were altered in the wake of 9/11

Vox's Lindsay Ellis wrote about the changes made to "Lilo and Stitch" in an examination of post-9/11 era of pop culture.

"By September 2001, ['Lilo and Stitch'] was mostly complete and nearing its planned 2002 release," Ellis wrote on Vox. "Where the original cut had Stitch doing a joyride in a 747, weaving through buildings, the final version changed the 747 to an alien craft and the buildings to Hawaiian mountains."

In 2013, YouTuber Daniel Lewis uploaded a compilation of the unreleased 747 airplane scene, showing how Stitch originally "hijacked" the plane from two pilots and kicked off all the passengers. The video has since been removed but had hundreds of thousands of views accumulated over the last six years.

Now you can see just the original version in one uploaded video which calls it a "deleted scene."

Seeing the scene is an unsettling reminder of how movies and TV shows used to approach storylines about airplane hijackings and aircrafts crashing into cityscapes. But after 9/11, the rules of acceptable violence changed the entertainment market.

"Americans became highly sensitive to anything that bore even a slight resemblance to the attacks," Ellis wrote. "Children's shows like 'Power Rangers,' 'Pokémon', and 'Invader Zim' had episodes taken off the air due to scenes where buildings and cityscapes were destroyed."

Watch the full Vox video below to see the deleted version of the airplane scene compared to the final "alien aircraft" crash: