The Krabby Patty is coming to Wendy’s for SpongeBob’s 25th birthday

New York (CNN) — Krusty Krab, the fictional fast-food restaurant in “SpongeBob SquarePants,” will never be real, but at least the second-best thing is — a Krabby Patty.

Wendy’s is releasing a special meal, in honor of the 25th anniversary of the “SpongeBob SquarePants” animated TV series, which includes a “Krabby Patty Kollab” cheeseburger and a “Pineapple Under the Sea” Frosty flavoring at its US and Canadian restaurants for a limited time beginning October 8.

The Krabby Patty is the same as a regular cheeseburger but with an additional slice of cheese and a “top-secret” Krabby Kollab sauce, the chain announced Wendnesday. The special Frosty is vanilla with a pineapple-and-mango-flavored puree swirled on top.

Tapping into consumers’ nostalgia by collaborating with a cartoon that millennials love could boost sales. Burger King also announced this week that it’s partnering with MGM’s “The Addams Family” animated film franchise for a “Wednesday’s Whopper” that has a purple-colored bun.

In a press release, Wendy’s said it only “makes sense that two of the most iconic squares in pop culture are teaming up,” a nod to the chain’s square burgers.

Using two foods that largely already exist on the menu makes it easy for employees to assemble the specials. McDonald’s often releases celebrity meals , which features food already on its menu but with a special name, finding financial success with them.

All fast-food chains are battling for dollars from American diners who are not going out to eat as often and spending less when they do, causing fast-food sales to slow and restaurant traffic to dip.

As a result, companies have released value meals and special promotions to ramp up sales. Whether the strategy is working will become clearer when earnings are released in the coming weeks.