"Boo!" is a Halloween-themed episode of the PBS Kids animated television series Clifford the Big Red Dog, originally aired with "Come Back, Mac" during the show's first season.
| Voice actor || Role
|John Ritter ||Clifford the Big Red Dog
|Grey Griffin ||Emily Elizabeth Howard|
|Kel Mitchell ||T-Bone
|Cree Summer ||Cleo|
|Cam Clarke ||Mr. Howard|
|Kath Soucie ||Jetta
|Earl Boen ||Horace Bleakman
|Edie McClurg ||Violet Bleakman
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