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Kiefer O'Reilly
Howard Lovecraft (Voice)

Jeffrey Combs
H.P. Lovecraft (voice)

Tyler Nicol
Winfield Lovecraft (voice)

Michelle O'Reilly
Sarah Lovecraft (voice)

Sean Patrick O'Reilly
Spot / Cthulhu (voice)

Alison Wandzura
Mary Lovecraft (voice)

Mark Hamill
Dr. Henry Armitage (voice)

Vijary Vaibhav Saini
Professor Jaswant Atwood (voice)

Ashleigh Ball
Ellen Ellery (voice)

Scott McNeil
Hamish Rice / Govlins (voice)

Nick Wolfhard
William Dyer (voice)

Christopher Plummer
Dr. Jeffrey West (voice)

Finn Wolfhard
Herbert West (voice)

Doug Bradley
Nyarlathotep (voice)

Summer O'Reilly
Gotha (voice)

Harmony O'Reilly
Innes (voice)