Mahesh "Bug" Vijay a brilliant but shy forensic entomologist from Liverpool. The always serious and rarely smiling young scientist has feelings for Lily which, until the final episode of Season 5, went unreciprocated. In the beginning of Season 6, with the cancellation of Lily's wedding, his relationship with Lily is beginning to move forward. However, things may be complicated by Lily's unexpected pregnancy with her former fiance, Jeffery. Bug has taken it upon himself to make Lily move in with him and support her and the baby.
In an episode called "Post Hoc," near the end of the final season, Bug disappears without a trace, to the great consternation of his colleagues. Dr. Macy makes inquiries and learns that Bug is being held incommunicado by the Department of Homeland Security, on suspicion of being a terrorist. He was finally released after an unseen interrogation that apparently included waterboarding, and is left deeply and understandably shaken by the experience.