Jonah Kaplan Gender: Male Portrayed by: Marc Jablon First Appearance ● NCIS: Agent Afloat (episode). Last Appearance ● NCIS: Agent Afloat (episode). List of Appearances Jonah Kaplan is a Lieutenant in the United States Navy who is assigned to the U.S.S. Seahawk. BiographyEdit Pre-SeriesEdit NCIS Season 6Edit Retrieved from "https://ncis.fandom.com/wiki/Jonah_Kaplan?oldid=120121" Categories: Americans One-Off NCIS Characters Naval Officers Suspects Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.