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The Grel were a humanoid race of data pirates native to the planet Grellor.


The Grel had bulbous heads and squid-like faces. (PROSE: Oh No It Isn't!) Grel had thick rubbery skin and could lose several layers of epidermis without harm. (PROSE: The Glass Prison)


The Grel afterlife was called Slawcor (PROSE: Oh No It Isn't!) and they worshipped the god Maa'lon. (PROSE: Where Angels Fear)


In a version of history brought about by the Doctor's changes to the timeline, the Grel invaded Earth in the 2150s. Before they landed they released a gas on the planet to make its inhabitants lose all their knowledge. They planned to harness the planet's magnetic core and turn it into a moving library. Bernice Summerfield turned their gas back on them, making them lose all the knowledge they had gathered. Bernice helped them get back to Grellor in exchange for the use of their time travel technology. (AUDIO: The Grel Invasion of Earth)

The Knights of Jeneve fought off the Grel. (PROSE: Dragon's Wrath)

In 2593, the Grel attacked the St Oscar's University expedition on Perfecton, but became trapped in the Perfecton pantomime. (PROSE: Oh No It Isn't!)

In 2595, the Grel came to Dellah to investigate reports that the god Maa'lon had returned. (PROSE: Where Angels Fear)

The Grel were seen as a credible threat to the Braxiatel Collection. (PROSE: Parallel Lives)

Sixty-eight Grel were taken during the Deindum War to work for the Deindum in the slave camps on Bastion. Rather than working in the pits with the other slaves, the Grel became food-servers and maintenance workers. (PROSE: Adorable Illusion) Peter Summerfield met a Grel on Bastion who believed that he had died and gone to Slawcor. (AUDIO: The Curse of Fenman) After the Deindum War had ended, surviving Grel told the rescue workers that Peter had managed to escape Bastion before the war ended. (PROSE: Adorable Illusion)

In 2648, the Grel built a time machine and went back to 2603 to abduct Peter Summerfield. (AUDIO: The Grel Escape)

The creators of EarthWorld believed that King Arthur and his knights went on a quest for the Holy Grel, a tentacled monster that would reveal to them good holy facts and bad holy facts. (PROSE: EarthWorld)