Episode 20
S30 E20 April 7, 2019 0h 22m
★ 5.9
Source:
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Guest Stars
Josh Groban
Professor Frink's Singing Voice (voice)
Maggie Roswell
Luann Van Houten (voice)
Tress MacNeille
Brandine Spuckler (voice)
John Lithgow
John Lithgow (voice)
Jon Lovitz
Llewellyn Sinclair (voice)
Kevin Michael Richardson
Mark (voice)
Pamela Hayden
Lady (voice)
