Cecily Strong

Actress, Comedian, "Saturday Night Live" Cast Member & Former Co-Anchor of "Weekend Update"

Nicole Byer

Comedian, Actress & Writer; Co-Host of "Wipeout"

Ellie Kemper

Actress, Comedian, & Writer Best Known for Her Roles in "The Office" & "Unbreakable Kimmy Schmidt"

Ian Somerhalder

Actor Known for "The Vampire Diaries"; Animal & Environmental Advocate; Founder of The Ian Somerhalder Foundation

William Shatner

Emmy-Award Winning Actor, Known for "Star Trek" & "Boston Legal"

Retta

Stand-Up Comedian & Actress Known for "Parks and Recreation"

Bill Nye

"The Science Guy"; Science Communicator, TV Presenter & Mechanical Engineer; Climate Change Activist

Spike Lee

Academy Award-Winning Writer, Producer, Actor & Director; Best Known for "BlacKkKlansman" & "Malcolm X"

Ashley Judd

Actress, Activist & Humanitarian

Nick Offerman

Actor, Writer & Carpenter; Best Known for "Parks and Recreation"

Alan Alda

Actor; Writer; Science Advocate; Director

Rob Lowe

Actor, Best-Selling Author, Podcaster & Philanthropist

Andie MacDowell

Film Actress

Blythe Danner

Emmy Award-Winning Actress & Activist

Gary Sinise

Actor & Advocate for America's Servicemen and Women; Founder of the Gary Sinise Foundation

Kevin Spacey

Two-Time Academy Award-Winning Actor, Director, Producer, Screenwriter and Singer; Best Known For His Roles in "American Beauty" and Netflix's "House of Cards"

Hasan Minhaj

Comedian, Actor, Writer & Star of "Patriot Act with Hasan Minhaj"

Ronda Rousey

Former UFC Champion & WWE Wrestler; Olympic Medalist; Actor & Author

Our Fight: A Memoir

Viola Davis

Academy Award-Winning Actress, Producer & New York Times Best-Selling Author

Viola Davis on Speaking Up, Challenging Stereotypes

Kevin Bacon

Actor, Musician, Founder of Sixdegrees.org