SpongeGar SquarePants is one of SpongeBob's prehistoric ancestors.
SpongeGar is likely to be more advanced than the Primitive Sponge because he has developed clothes, a language system, domestication and a curiosity for new discoveries such as cooking food.
His pet snail Prehistoric Gary was a lot larger than the present Gary raised by the normal SpongeBob. This Prehistoric Gary was most likely an ancestor of the normal Gary.
His best friend is Patar which is one of Patrick's prehistoric ancestors. He is not the same as Primitive Sponge; he came many years after the primitive. He is curious and smarter than Primitive Sponge, SpongeGar is also an ancestor of SpongeTron.
Like his descendant, SpongeGar is a sea sponge, but he is drawn to resemble a kitchen sponge. SpongeGar has large blue eyes, a long, slightly curved nose, a large mouth with one buck tooth, two fang-like teeth, a unibrow, and dimples with three freckles on each cheek. He wears a brown animal skin with only a left sleeve (He also uses it as a blanket to sleep with.) He also has hair showing from his feet and hands.
He was mistaken by Squog (the prehistoric version of Squidward) to be dumb, but he has proven to be somewhat intelligent in that episode.