“Who lives in a pineapple under the sea?” Many people know the answer: SpongeBob SquarePants.

To celebrate the animated Nickelodeon show’s 25th anniversary, Wendy’s has partnered with Paramount to release a Krabby Patty collab menu.

Menu items include a Krabby Patty Kollab Burger and Pineapple Under the Sea Frosty, available nationwide starting Tuesday.

“The Krabby Patty Kollab Burger is Wendy’s take on the most sought-after recipe in all of Bikini Bottom,” the chain’s announcement reads.

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.

The Pineapple Under the Sea Frosty is Wendy’s signature vanilla frosty with a pineapple-mango flavored puree swirl, according to Wendy’s.

Both will be available for a limited time.

BBBBRRREAKING NEWWWS pic.twitter.com/Vw5FulLl0U

— Wendy’s (@Wendy’s) October 2, 2024

What’s in the top secret sauce?

“Our top secret Krabby Kolab Sauce is a closely guarded recipe that makes the first bite of the Krabby Patty Kolab Burger worth the wait for SpongeBob SquarePants fans and Wendy’s customers alike,” a Wendy’s spokesperson told USA Today.

Just as Mr. Krabs guards the Krabby Patty’s secret formula on the show, Wendy’s plans to guard the sauce’s recipe in real life.

“In a world where people go all out, Wendy’s is known for quality in everything we do – from our fresh, famous food to our collaborations with brands our fans love,” said Lindsay Radkoski, U.S. marketing director from The Wendy’s Co. “So it makes sense that two of pop culture’s most iconic spots are joining forces to offer fans of all ages a taste of this unique, limited-time experience.”

The Krabby Patty Kollab program will bring “SpongeBob SquarePants” Krabby Patty-inspired foods into the real world and onto menus for the first time ever, USA Today reported. The animated series first premiered on Nickelodeon in 1999, USA Today reported.