Simon Frankel was a hacker who was interviewed by NCIS during their investigation into the death of Marine Sergeant Joseph Turner and Petty Officer Finnegan Blake's mysterious disappearance and eventual murder.
Eager to prove himself, he began sending encoded IM messages to the NCIS team, giving them hints about the case and one of these clues led them to the mysterious group known as "Red Cell".
Although Frankel was dismissed after being found innocent, he did give the team some key information concerning Midshipman Ashley Simmons.
- Jon Wellner who plays Frankel would later go to play Lab Tech, Henry Andrews in the series, "CSI: Crime Scene Investigation".
- Was seen wearing his watch on his right hand, suggesting that he might be left-handed.
- Tony gave him the nickname, "Urkel".