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Watching earlier episodes in season 1 helps you follow the plot and character arcs leading into this episode.

Watch Mystérieusement Vôtre, Signé Scooby-Doo Season 1 Episode 3 Online

Q: Where can I watch “Mystérieusement Vôtre, Signé Scooby-Doo” Season 1 Episode 3 online?

This page provides episode info and a legal-only guide. It does not host streams or downloads. Check official platforms and licensed services for availability in your region (US first).

“La Maison hantée” — Watch "Mystérieusement Vôtre, Signé Scooby-Doo" Season 1 Episode 3 online in HD for free. Check streaming providers, cast, and episode details.

Sep 10, 1983 Season 1 Episode 3 11 min TV-G

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Mystérieusement Vôtre, Signé Scooby-Doo Season 1

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Season 1 Episode 3 — Aired on Sep 10, 1983 • runs about 11 minutes.

Notable cast/guest names in this episode include Casey Kasem, Heather North, Don Messick.

This page includes 1 official still(s) (when available) plus legal availability links.

Looking for “watch Mystérieusement Vôtre, Signé Scooby-Doo Season 1 Episode 3 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

Daphné verrouille tout le monde dans une vieille maison pour la nuit pour prouver qu'il n'est pas hanté. Mais quand elle découvre un journal intime, tout ce qu'elle écrit est vrai pour Sammy et Scooby, y compris les fantômes!