Mark-Paul Gosselaar to stop by Fallon's, David Duchovny & Anna Friel to do 'Conan'

Zack Morris is on "Fallon"...

"Late Show with David Letterman": Howard Stern

"The Tonight Show with Conan O'Brien": David Duchovny, Anna Friel

"Late Night with Jimmy Fallon": Kelly Ripa, Mark-Paul Gosselaar

"Last Call with Carson Daly": Idris Elba (repeat)

"Live with Regis and Kelly": Wilmer Valderrama, guest co-host Mark Consuelos

"The Ellen DeGeneres Show": Felicity Huffman, Shawn Johnson and Mark
Ballas (repeat)

"The Bonnie Hunt Show": Kaley Cuoco (repeat)