Timothy 'Tim' mcgee
Timothy McGee, portrayed by Sean Murray, first appeared in the episode "Sub Rosa" as a Case Agent stationed at Norfolk, and was promoted to Field Agent and assigned to Agent Gibbs' team in the second season, becoming a regular character, where he became a Junior Special Agent with NCIS. He serves as a field computer consultant and occasionally assists Abby Sciuto in the lab.
He clashes with DiNozzo, though after the two became partners (following Ziva's departure from the team at the end of season six), they are frequently shown to form an effective team; however, once Ziva returns, their relationship reverts to its original state. McGee's methods are often indecipherable to the other team members, have earned him the pejorative nickname "McGeek" and "McGoo" (along with other derisive nicknames based on his surname), as well as "Probie", and "Elf Lord", the latter used by multiple characters due to his elf character in an online role playing computer game. He was trained in biomedical engineering at Johns Hopkins University, and computer forensics at Massachusetts Institute of Technology (MIT). He also graduated the top of his class at the Federal Law Enforcement Training Center.
McGee is also a writer, writing mystery crime novels including a national best seller, Deep Six, under the pseudonymThom E. Gemcity (an anagram of his name),
featuring characters based on his fellow co-workers and others from his everyday life. He also drives a silver Porsche Boxster as seen in the episode "Twisted Sister". He has Apple'siPhonesmartphone, and uses it frequently on investigation. He owns a dog named Jethro. Jethro was in a prior episode
where he had been falsely accused of killing his police handler. Abby proved his innocence, named him Jethro and had to convince McGee to take Jethro because her landlord wouldn't let her keep the dog. ("Dog Tags") Transferred to Cybercrimes Division in Season 5 ("Judgment Day") Transferred back to the Major Case
Response Team in Season 6 ("Last Man Standing")