Behind 'Clark Kent' glasses, Bob Costas reports from Studio A at the International Broadcasting Center, which he says resembles Superman's 'Fortress of Solitude.'
Kathy Griffin talks about her Grammy win and more.
Pistorius undergoes brutal cross-examination.
Sherri Shepherd and Jenny McCarthy dissect the latest pop culture news.
Country singer Ronnie Dunn performs "Country This."
Music video by Laroo T.H.H. performing Primetime. 2011
ABC News' Charles Gibson sits with us to discuss this special report.
Feud Between Two Neighbors Ends in Death; Why People Lose It Waiting in Line; U.S. Senator Punches Fellow Senator in the Head
20/20 looks at the story of a teen who goes from being an A student to missing to murdered .
What really happened between a loving mom and a teen football player?
Wildly successful moguls give back, share their secrets with Barbara Walters.
How the explosively popular video-sharing site has changed lives.
The Sixth Sense: Victims track down records showing boyfriend with HIV knew he had virus.
The Sixth Sense: Discover how a dogged detective cracked a mind-boggling mystery.
The Sixth Sense: In prescient letters, two women predicted their own deaths.
Meet a woman who walks on airplanes, a man with arms of steel and more.
A behind-the-scenes look at the pop culture phenomenon of reality television.
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