Millie Bobby Brown ( Millie Bobby Brown )

Michelle

Chris Pratt ( Chris Pratt )

Stanley Tucci ( Stanley Tucci )

Jason Alexander ( Jason Alexander )

Brian Cox ( Brian Cox )

(voice)

Jenny Slate ( Jenny Slate )

(voice)

Woody Norman ( Woody Norman )

Christopher

Giancarlo Esposito ( Giancarlo Esposito )

Marshall (voice)

Anthony Mackie ( Anthony Mackie )

(voice)

Billy Bob Thornton ( Billy Bob Thornton )

(voice)

Ke Huy Quan ( Ke Huy Quan )

Katelin Chesna ( Katelin Chesna )

Hospital Doctor

Martin Klebba ( Martin Klebba )

Herman

Adam Croasdell ( Adam Croasdell )

Marshall

Terry Notary ( Terry Notary )

Cuyle Carvin ( Cuyle Carvin )

Gabrielle Maiden ( Gabrielle Maiden )

Penny Pal

Joe Avena ( Joe Avena )

President Clinton

Sebastian Soler ( Sebastian Soler )

Orderly

Woody Harrelson ( Woody Harrelson )

Helen Hunt ( Helen Hunt )