Season 20 Details Casts Episode Lists of Season 20 Title Season 20 Genres Kids Comedy Air Date 1988-11-21 Episode Runtime 00 Hours 54 Minutes Season Number 20 Episode Count On Season 20 33 Production Companies Sesame Workshop, Children's Television Workshop Kevin Clash Elmo/Hoots the Owl/Baby ? Caroll Spinney Big Bird Frank Oz Bert Sonia Manzano Maria Figueroa Rodriguez Roscoe Orman Gordon Robinson Martin P. Robinson Telly Monster/Aloysius S? Richard Hunt Fran Brill Zoe/Prairie Dawn (voice) Leslie Carrara-Rudolph Abby Cadabby Leslie Carrara-Rudolph Muppet Leslie Carrara-Rudolph Virginia Virginia Leslie Carrara-Rudolph Grouch Caroll Spinney Oscar the Grouch Caroll Spinney Sam the Robot Caroll Spinney Bennett Snerf Caroll Spinney Cookie Monster Kevin Clash Clementine Kevin Clash Hoots the Owl Kevin Clash Baby Natasha Dave Goelz Eric Jacobson Jim Henson Linda Bove Linda Pam Arciero Joey Mazzarino Stinky Joey Mazzarino Murray & Blogg Martin P. Robinson Irvine David Rudman Cookie Monster / Two-Hea? David Rudman Two-Headed Monster Suki Lopez Nina Violet Tinnirello Charlie Jennifer Barnhart Zoe (voice) Ryan Dillon Elmo (voice) Alan Muraoka Alan Episode 1 1988-11-21 Episode 570... Episode 2 Episode 571... Episode 3 Episode 572... Episode 4 Episode 573... Episode 5 Episode 574... Episode 6 Episode 575... Episode 7 Episode 576... Episode 8 Episode 577... Episode 9 1988-12-01 Episode 578... Episode 10 1988-12-02 Episode 579... Episode 11 1988-12-05 Episode 580... Episode 12 Episode 581... Episode 13 Episode 582... Episode 14 1988-12-08 Episode 583... Episode 15 1988-12-09 Episode 584... Episode 16 Episode 585... Episode 17 Episode 586... Episode 18 1988-12-19 Episode 587... Episode 19 Episode 588... Episode 20 1989-01-03 Episode 589... Episode 21 Episode 590... Episode 22 Episode 591... Episode 23 Episode 592... Episode 24 Episode 593... Episode 25 1989-03-01 Episode 594... Episode 26 Episode 595... Episode 27 Episode 596... Episode 28 Episode 597... Episode 29 Episode 598... Episode 30 1989-03-23 Episode 599... Episode 47 1989-04-26 Eipsode 2598... Episode 129 1989-05-18 Episode 2614... Episode 130 1989-05-19 Episode 2615 - Birth of G...