The Event is an emotional high-octane conspiracy thriller with sci-fi elements, that follows Sean Walker (Jason Ritter, "The Class"), an Everyman who investigates the mysterious disappearance of his fiancee, Leila (Sarah Roemer, "Disturbia"), and unwittingly begins to expose the biggest cover-up in U.S. history. Sean's quest will send ripples through the lives of an eclectic band of strangers, including: newly elected U.S. President Martinez (Blair Underwood, "Dirty Sexy Money"), Sophia (Emmy Award nominee Laura Innes, "ER"), who is the leader of a mysterious group of detainees, and Sean's shadowy father-in-law (Scott Patterson, "Gilmore Girls"). Their futures are on a collision course in a global conspiracy that could ultimately change the fate of mankind. (Source: NBC)