A prototype is a preliminary version of a subject that is created before it is released. There have been prototypes of parts, themes, and minifigures.

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Prototype Pieces

The red, yellow and blue Atlantis treasure keys

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Various prototype colours for bikes Two prototype coloured trees beside a green one

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Dark Grey Idol

Source: [1]

Mars Mission

Pirates





Unspecified

Prototype sets

Source: BZPower.com, German BIONICLE Magazine, Brickshelf, LEGO.com

Castle

Source: [2]

Source: [3]

Source: [4]

Space (No Name)

Castle (No Name)

Source: [5]

Prototype theme images

Space (no-name)

Unreleased Sets

Unreleased Themes