How I Met Your Mother

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Alyson Hannigan Last appearance: Late Show with David Letterman on April 14, 2010

Cobie Smulders Last appearance: Late Late Show with Craig Ferguson on February 8, 2010

Jason Segel Last appearance: Late Show with David Letterman on July 9, 2010

Josh Radnor Last appearance: Late Late Show with Craig Ferguson on April 10, 2009

Neil Patrick Harris Last appearance: Late Show with David Letterman on July 29, 2010