We asked what's inside

Wendy's announced Wednesday that it plans to launch a new cheeseburger called the “Krabby Patty Kollab,” which, in true “SpongeBob” style, comes with a “top secret” sauce.

As part of the collaboration with Paramount, a vanilla Frosty with a pineapple-mango-flavored puree swirl is also being released, called Pineapple Under the Sea Frosty. But the main item is the fast food chain's version of the famous Krabby Patty, the Krabby Patty Kollab Burger.

The burger consists of a quarter pound of beef, two slices of melted American cheese, lettuce, tomato, pickle, onion and a “top secret shrimp kolab sauce” on a toasted bun.

But what's so special about the Krabby Patty and its secret sauce? Wendy's is tight-lipped on details, but here's what we know so far.