The Rusty Krab was a retirement home in Bikini Bottom, which was later acquired by Mr. Krabs in 1965 and converted into the Krusty Krab. The Rusty Krab was only seen and stated in the Krusty Krab Training Video. Ever since the Rusty Krab was shut down, Shady Shoals has been the only known rest home in Bikini Bottom.
The Rusty Krab looks no different than the Krusty Krab (besides the fact it has no "K" in the sign and later on it was painted there by Mr. Krabs), but it possibly looks different from the inside since it's a retirement home.
- In Grandpappy the Pirate, Mr. Krabs says that the Krusty Krab used to be a boat, and that it was always called the Krusty Krab, but in the Krusty Krab Training Video, he says that the Krusty Krab used to be a retirement home. This is a plothole.
- The design of the Rusty Krab does not resemble that of a normal retirement home's.