John Mulaney and his kid pals tackle existential topics for all ages with catchy songs, comedy sketches and special guests in a nostalgic variety special.

After getting accepted to Brooklyn Heights University, Leah Masters convinces her cult leader parents, Rainey and Connor, to allow her to leave "The Mountain" so that she can recruit new members. However, unbeknownst to her parents, Leah is joined by ousted cult member Clarissa Duffer. Back at "The Mountain", the FBI are watching them.