Caitlin "Kate" Todd is a fictional character featured in the CBS television drama NCIS portrayed by Sasha Alexander, appearing in 49 episodes of the series. Alexander made her series debut in the episode "Yankee White", before departing the regular cast in the season two finale "Twilight". Alexander was credited as a guest star for her appearances in the season 3 episodes "Kill Ari " and "Kill Ari ," and appeared uncredited as a voice actor during season 8's "A Man Walks Into a Bar". Subsequently, Alexander has appeared in photographs, flashbacks, archive footage, and CGI footage. Her most recent appearance was through archive footage in "Two Steps Back".