Brian and Stewie set out to write a hit Halloween song; Peter and the guys discover that lying about trick-or-treating can have deadly consequences.

Jimmy welcomes singer Taylor Swift, actress Keri Russell, and a musical performance by The Format.

Coaches Michael Bublé, Niall Horan, Reba McEntire and Snoop Dogg all vie to discover and coach the next singing phenomenon on the fourth night of Blind Auditions.