When trying to determine what caused the blackboard in Marvin's classroom to shatter, it is suggested it could have been a sharp sound, but Wendy doubts this, due to the fact that the windows in the room did not shatter.
- ↑ As seen in the Super Friends first season episode The Ultra Beam (1973).
- ↑ As seen in The Ultra Beam.
- ↑ As seen in The Mysterious Moles.
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