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This object exists primarily within the Sonic Underground continuity.
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.

The Holographic Cube[1] is an object that appears in the Sonic Underground television series. It is a cube used for communication purposes.


Holographic Cubes are white cubes that can fit into the palm of one's hands. When used with a certain device, the can project holograms and pre-recorded sounds in order to send messages to others.[1]


Bartleby received a Holographic Cube which contained an invitation to a demonstration of a De-Roboticizer. Sleet also got his hands on one, and presented it to Robotnik, who instructed for him and Dingo to go and investigate.[1]


  1. 1.0 1.1 1.2 Hurst, Ben (13 October 1999). "Healer". Sonic Underground. Season 1. Episode 33. First-run syndication.
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