Will the real Bob please step forward? There might not be a virus, but life's still interesting in Mainframe when a second Bob comes on the scene. No one knows which is which - including the two Bobs. With wedding preparations underway, Dot can't decide who to marry and turns to her friends for assistance. Meanwhile, an old enemy returns to the system and only one of the Sprites can save the Mainframe inhabitants.

High school teacher Lauren finds her life up side down when her job, the custody of her adopted daughter and even her safety is in danger when an angry student falsely claims to have had an affair with her.

Beginning with the 1993 bombing of the World Trade Center and ending on the morning of 9/11, the draws on detailed information from the 9/11 Commission Report to take viewers on an unforgettable journey through the events that presaged that fateful day -- to understand what went right and wrong, and what can be learned from this crucial eight-year period.