Mandrel

Mandrels were large, dangerous predators.

Biology
Mandrels were humanoid creatures native to the planet Eden. They had large, almost clam-shaped heads with glowing green eyes and small tendrils around their mouth and green, leathery skin and black fur down their back and around their arms. They had three long fingers on each hand, which were tipped with sharp claws. They mainly hunted by sound and were attracted by ultrasonic noises.

Mandrels were dangerous predators, able to easily kill a human. They were absurdly tough, and able to survive repeated laser blasts. The only known method to kill a Mandrel was electrocution. Luckily, they weren't especially intelligent and could easily be fooled.

They had the unusual characteristic that they decomposed into Vraxoin after being electrocuted. (DW: Nightmare of Eden)


 * Based on the alternate source of Vraxoin, Mandrels may actually be fungus-based.

History
As part of a ritual to summon Artemis in 1976, (which required the blood of five species whose destinies had been affected by the Time Lords) the Monk included the blood of a Mandrel. (NA: No Future)


 * It was not revealed in what way the Time Lords affected the Mandrels' development.

As shown in the Anubian History Book, the Anubians attacked the Mandrels. (K9TV: Curse of Anubis)

In 2116, Tryst tried to smuggled vraxoin in the form of Mandrels. A section of Eden with Mandrels was captured with a Continuous Event Transmuter. When the ship they were travelling in crashed, the Mandrels were accidentally released. The Fourth Doctor and Romana returned the Mandrels, repaired the machine and planned to return the Mandrels to their homeworld. (DW: Nightmare of Eden)