Gibbs posed as a homeless man.
Though Gibbs typically looks polished, he swapped his dress shirts and slacks for a hodgepodge outfit while undercover on an important assignment.
When a cyber attack lead to the death of an NCIS agent, Gibbs and the team staked out in adopted aliases—McGee played a building maintenance man, Ziva played a floozy, and DiNozzo hid out in a dumpster—to catch Ajay Khan, a hacker, who could lead them to the world's most-wanted cyber-terrorist.
Watch them work together to take down Khan in "Canary" (Episode 14, Season 10 of NCIS).
Watch NCIS on Tuesdays at 8/7c on CBS and CBS All Access.