Look who's come to visit The Count's spooky castle. It's Elmo! Is he scared? Only for a second because soon he's having a howling good time as his Sesame Street friends stir up some spirited fun. Get ready for nonstop jokes, songs and spooky surprises with Telly, Baby Bear, Bert and Ernie. Elmo Says Boo! is sure to make you shriek — with laughter.
| Actor | Role |
|---|---|
 Jerry NelsonThe Count | The Count |
 Kevin ClashElmo | Elmo |
 Martin P. RobinsonTelly | Telly |
 David RudmanBaby Bear / Davey Monkey | Baby Bear / Davey Monkey |
 Joey MazzarinoJoey Monkey / Darknut | Joey Monkey / Darknut |
 Carmen OsbahrRosita | Rosita |
 Peter LinzAdditional Muppets (voice) | Additional Muppets (voice) |
 Frank OzBert (voice) | Bert (voice) |
 Richard HuntKermit the Forg / Frazzletone (archive footage) | Kermit the Forg / Frazzletone (archive footage) |
 Jim HensonErnie / Harvey Monster (voice) (archive footage) | Ernie / Harvey Monster (voice) (archive footage) |
 Julia RobertsSelf | Self |
 Lillias WhiteSelf | Self |
| JJoseph BrancaleNot listed | Not listed |
| CCecilia GonzalezNot listed | Not listed |
| EEileen GonzalesNot listed | Not listed |
| MMelissa RemoNot listed | Not listed |
 Nicholas SullivanNot listed | Not listed |
| CChristopher CerfChrissy (voice) (uncredited) | Chrissy (voice) (uncredited) |