S20, EP9 "The Fatman Always Rings Twice"
In noir-style, Peter/Mac investigates the disappearance of Meg/Sister Megan.
S20, EP8 "The Birthday Bootlegger"
A new boss quells Peter's favorite part about work: office birthdays; Stewie is put in detention and comes out a ruffian.
S20, EP7 "Peterschmidt Manor"
Lois and her father attend the funeral of Lois' childhood nanny; Peter and the rest of the family turn Pewterschmidt mansion into a hotel.
S20, EP6 "Cootie & The Blowhard"
Stewie takes drastic measures when he thinks he is diagnosed with terminal cooties; Peter becomes infatuated with Bonnie's cooking.
S20, EP5 "Brief Encounter"
When Peter and Quagmire accidentally switch underwear, they begin to mimic the other's behavior; Stewie and Doug agree to commit each other's murders.