Conan O'Brien will appear on "The Tonight Show Starring Jimmy Fallon" on Tuesday night.
It'll be his first time back since his short-lived stint as host ended 14 years ago. He replaced Jay Leno in June of 2009 . . . and then was replaced by Jay in January of 2010.
Conan will be promoting his upcoming travel series, "Conan O'Brien Must Go", where he visits new friends in Norway, Thailand, Argentina, and Ireland. The first episode premieres April 18th on Max.
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