Question: when did the last episode of the simpsons air
Answer: Guest stars : Ray Liotta as Morty Szyslak ; Moe 's father , Debi Mazar as Minnie Szyslak ; Moe 's sister and Jonathan Schmock as Salesman 635 17 `` Lisa Gets the Blues '' TBA TBA April 22 , 2018 ( 2018 - 04 - 22 ) XABF11 TBD Guest star : Trombone Shorty as Trombonist 636 18 `` Forgive and Regret '' TBA TBA April 29 , 2018 ( 2018 - 04 - 29 ) XABF09 TBD 637 19 `` Left Behind '' TBA TBA May 6 , 2018 ( 2018 - 05 - 06 ) XABF12 TBD 638 20 `` Throw Grampa from the Dane '' TBA TBA May 13 , 2018 ( 2018 - 05 - 13 ) XABF13 TBD