I think these were old prototypes from when monster high was first
2009 Monster High Original 1st Wave Lagoona Blue Doll
Upgrade vs. Prototype Fight - TV Tropes
The Monster High Movie Just Took A Big Step Forward
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Monster High Deals
Mattel designer reveals Monster High prototypes!
The 'Caspian Sea Monster' rises from the grave
A Brief History of G1 Monster High prototype dolls!
Welcome to Monster High™ Prototypes!
Monster High Dolls by Mattel
How Lego Is Constructing the Next Generation of Engineers, Innovation
Monster High Great Scarrier Reef Down Under Ghouls Posea Reef Doll
The 200 Best Horror Movies of All Time
S.T.A.L.K.E.R. The Board Game by Awaken Realms - Pre-campaign update #3 / Photos of the prototype, first S.T.A.L.K.E.R. dev diary, and the campaign start date! - Gamefound
Monster High (franchise), Monster High Wiki