An American Pickle is a comedy film that tells the story of Herschel Greenbaum, a struggling immigrant who falls into a vat of pickles and is preserved for a century. When he wakes up in modern-day Brooklyn, he discovers that he has a great-grandson named Ben, who helps him adjust to the 21st century. The film explores themes of family, identity, and the immigrant experience, with a mix of humor and heartwarming moments.