Mallon was a male Gatherer living at the outpost on Gamma Hromi II.

In 2366, Mallon was put in charge of the Gatherers by Brull while he was aboard the USS Enterprise-D to engage in peace talks with Sovereign Marouk, the Acamarian leader, and Gatherer leader Chorgan. (TNG: "The Vengeance Factor")

Mallon was played by an unknown actor.
According to the Star Trek: The Next Generation Companion, Mallon was played by Marina Sirtis' husband Michael Lamper. He actually played another unnamed Gatherer.
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