Marvin writing on a Blackboard[1]

A blackboard is a flat surface, usually hung up on walls in classrooms, that is used for writing with chalk. Most blackboards are made of slate.

Marvin was once punished for talking out of turn during class, and was forced to write on the blackboard several times that he wouldn't do it again. At the instant, both blackboards in the classroom shattered.[2]

When the Super Friends were trying to determine if there was a connection between trees and rocks walking by themselves, the Mole family, and the theft of cooling units, they had a think-session about it and used a blackboard.[3]


  1. As seen in The Ultra Beam.
  2. As seen in The Ultra Beam.
  3. As seen in The Mysterious Moles.

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