Tonight, Conan O'Brien returns as a guest on Late Show with David Letterman for the first time in 13 years, re-visiting his battle with Jay Leno over the Tonight Show.
RELATED: Conan O'Brien Pokes Fun at ET's Captain America Exclusive
"The only consolation I took during that period was that you were happy," O'Brien told Letterman, who went through a similar battle with Leno after Johnny Carson left the Tonight Show in 1992.
Letterman joked that he viewed O'Brien's brief time at the helm of the Tonight Show as "the Golden Age of television."
Watch O'Brien's entire sit-down on the Late Show tonight at 11:35/10:35c on CBS.
Related stories on ETonline.com:A 'Grey's Anatomy' Relationship Put to the Test
From Brad Pitt to Ian Somerhalder, see some of Hollywood's sexiest vampires.
Find out what Oscar winners Jared Leto and Lupita Nyong’o have been up to since the Academy Awards on Celebs Gone Social.
Rihanna, Nicole Richie, and Rita Ora all get an F on this week's Fashion Offenders
Kim Kardashian, Bar Refaeli and Heidi Klum share their best bikini pics on social media on Celebs Gone Social.
From Kim Kardashian to Paris Hilton, see which stars have the most expensive engagement bling.
See where the cast of "Cruel Intentions" is today.
Khloe Kardashian, Jennifer Hudson, and Christina Hendricks all get an F on this week's Fashion Offenders
© 2014 Microsoft