Neil DeGrasse Tyson/Saoirse Ronan/Finn Wolfhard, Gaten Matarazzo, Caleb McLaughlin & Noah Schnapp/Billy Corgan

James Corden

Self - Host

Reggie Watts

Self - Bandleader

Caleb McLaughlin

Self - Guest

Finn Wolfhard

Self - Guest

Noah Schnapp

Self - Guest

Gaten Matarazzo

Self - Guest

Saoirse Ronan

Self - Guest

Neil deGrasse Tyson

Self - Guest

Billy Corgan

Self - Musical Guest