Gastropod

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The Gastropods, led by Mestor, devoured the vegetation of the planet Jaconda.

A Gastropod using it's mental powers against Azmael. (DW: The Twin Dilemma)

Biology

The Gastropods resembled humanoid slugs. They left a sticky trail. Unspeaking, they followed the commands of Mestor, leaving one to assume they made only vestigial intelligence. Mestor planned to make the Jaconda's sun go supernova so as to scatter Gastropod eggs into space. (DW: The Twin Dilemma)

Abilities

Gastropods had a form of mental powers which they could use to either kill individuals or take over their mind and communicate through them. They could also communicate telepathically. (DW: The Twin Dilemma)

History

Jaconda, once a verdant paradise, became a despoiled wasteland once the Gastropod appeared and made the Jacondans slaves in their own world. The Sixth Doctor killed Mestor and ended the reign of the Gastropods. (DW: The Twin Dilemma)

Behind the scenes