The Burger King "Stranger Things: The Upside Down Whopper" campaign is a creative and pop culture-inspired marketing initiative launched by Burger King in partnership with Netflix to promote the third season of the popular TV series "Stranger Things." The campaign introduced a limited-edition burger called the "Upside Down Whopper," which was inspired by the show's alternate dimension, "the Upside Down."

Here are the key details about the Burger King "Stranger Things: The Upside Down Whopper" campaign:

1. Concept: The central concept of the campaign was to create a unique tie-in with the "Stranger Things" series by offering a fictional menu item inspired by the show's supernatural world.

2. Upside Down Whopper: The "Upside Down Whopper" was essentially a standard Burger King Whopper, but it was served in upside-down packaging to mimic the look of the alternate dimension from the series.

3. Limited Time: The burger was available for a limited time at select Burger King locations in the United States to coincide with the release of the third season of "Stranger Things."

4. Collectible Packaging: The packaging for the "Upside Down Whopper" featured a distinctive design to evoke the eerie and mysterious atmosphere of the show's Upside Down world.

5. Collaboration: The campaign was done in collaboration with Netflix, the streaming platform that airs "Stranger Things," and it leveraged the show's fanbase.

6. Nostalgia: "Stranger Things" is known for its nostalgic references to the 1980s, and the campaign tapped into this nostalgia by offering a throwback to the packaging of that era.

7. Promotional Video: Burger King released a promotional video that featured characters from the series and highlighted the "Upside Down Whopper" as a limited-edition tie-in.

8. Social Media Engagement: The campaign encouraged social media engagement and the sharing of photos and experiences related to the "Upside Down Whopper" using the hashtag #StrangerThings.

9. Pop Culture Buzz: The campaign generated significant buzz and discussion, both among fans of "Stranger Things" and those intrigued by the creative tie-in.

10. Brand Promotion: While the campaign focused on the "Upside Down Whopper," it also promoted other Burger King menu items, effectively driving traffic to the restaurants.

The Burger King "Stranger Things: The Upside Down Whopper" campaign is an example of how brands can leverage pop culture phenomena and limited-edition menu items to generate excitement, engage with fans of a popular TV series, and create a unique dining experience for customers. It successfully tapped into the nostalgia and enthusiasm surrounding "Stranger Things" to drive interest and traffic to Burger King locations.