The Giant Krabby Patty is a giant Krabby Patty that only appeared in the episode "The Krabby Patty That Ate Bikini Bottom." Strangely, and abnormally, it is alive. (This could have been a side-effect of Sandy's growth serum.)
It was a normal-sized patty, but Mr. Krabs stole a growth serum from Sandy and administered it to the patty, making it grow.
Description
It looks just like a normal Krabby Patty, only it is much, much bigger.
Role in series
During its growth, it ate the Krusty Krab, and Cashy. It grew so large, it covered up, and ate most of the citizens of Bikini Bottom. It was finally destroyed after SpongeBob absorbed it into his body, making it 'spit out' everything and everyone it had 'eaten'.