Suggestions by @matthewweikert

John Travolta

as Danny Zuko in Walt Disney World Wizard of Oz

Jeff Conaway

as Kenickie in Walt Disney World Wizard of Oz

Martin P. Robinson

as Slimey the Worm in Walt Disney World Wizard of Oz

Slimey

as Witch's Pet Worm in Walt Disney World Wizard of Oz

Caroll Spinney

as Oscar the Grouch in Walt Disney World Wizard of Oz

Oscar the Grouch

as Wicked Witch of the West in Walt Disney World Wizard of Oz

Frank Oz

as Grover in Walt Disney World Wizard of Oz

Grover (Sesame Street)

as Emerald City Lab Assistant in Walt Disney World Wizard of Oz

Jerry Nelson

as Herry Monster in Walt Disney World Wizard of Oz

Herry Monster

as Emerald City Labs Scientist in Walt Disney World Wizard of Oz

Kevin Clash

as Elmo in Walt Disney World Wizard of Oz

Elmo (Sesame Street)

as Wizard's Assistant in Walt Disney World Wizard of Oz

David Ogden Stiers

as Governor Ratcliffe in Walt Disney World Wizard of Oz

Governor Ratcliffe

as Guard in Walt Disney World Wizard of Oz

Keith David

as Dr. Facilier in Walt Disney World Wizard of Oz

Dr. Facilier (The Shadow Man)

as Poppyfields Nightclub Bouncer in Walt Disney World Wizard of Oz

Frank Oz

as Bert in Walt Disney World Wizard of Oz

Ken Page

as Oogie Boogie in Walt Disney World Wizard of Oz

Bert (Sesame Street)

as Kalidah Monsters in Walt Disney World Wizard of Oz

Oogie Boogie

as Kalidah Monsters in Walt Disney World Wizard of Oz