Kiefer O'Reilly

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Jeffrey Combs

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Tyler Nicol

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Michelle Myers

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Sean Patrick O'Reilly

Spot / Cthulhu (voice)

Alison Wandzura

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Mark Hamill

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Vijary Vaibhav Saini

Professor Jaswant Atwood (voice)

Ashleigh Ball

Ellen Ellery (voice)

Scott McNeil

Hamish Rice / Govlins (voice)

Nick Wolfhard

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Christopher Plummer

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Finn Wolfhard

Herbert West (voice)

Doug Bradley

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Summer O'Reilly

Gotha (voice)