Stephanie Hsu
Dr. Sleech (voice) (8 eps)
Keke Palmer
Dr. Klak (voice) (8 eps)
Maya Rudolph
Dr. Vlam (voice) (8 eps)
Kieran Culkin
Dr. Plowp (voice) (8 eps)
Sam Smith
Dr. Azel (voice) (8 eps)
Natasha Lyonne
Nurse Tup (voice) (8 eps)
Greta Lee
(voice) (8 eps)