Batman uses one of his Batlights to send Marvin and Wendy a message in Bat-code.[1]

The Bat-code is Batman's special long distance communication code, similar to Morse code. The code was presumably developed by Batman, and thus his sidekick Robin was familiar with it, and Marvin and Wendy were also able to decipher it.

Batman used his bat-code to send a message to Marvin and Wendy, who were on the other side of Mystery Mountain.[2]

Appearance

Super Friends

References

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