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If you were looking for the article about the mercenary, then see Dennis.
In "The Sponge Who Could Fly," he says went to elementary school with SpongeBob, and SpongeBob remembered him right away, Dennis probably did something so important that SpongeBob remembered him. Since he is an elder, and seems much older than SpongeBob, it could be just the fact that he could have been the oldest in his class or school and/or held back in school quite a few years.