Shelk

Sister Shelk was one of the wives of the Sycorax tribe who invaded Earth in 2006.

When the Sycorax wives went looking for their husbands in the Sol system following the failed invasion, they found nothing but the dust remains of the ship. They landed their own ship in the Caribbean, disguising it as an island called Shadow Cay, which became populated by humans turned into zombies, known as abstracts, by the Gilfane Craw. The abstracts were used to find the black box recorder the Foraxi Yox so they could disover the truth of what happened to the Sycorax on the first ship.

In 2009, Sister Shelk ordered a group of humans lured to the Church of the Sycorax on the island to get captured. After the first ship's Foraxi Yox was salvaged, the Haxan Craw ordered Sister Shelk to kill all of the humans, but Donna Noble and Norah were able to free them. At the same time, the Tenth Doctor controlled the abstracts on the island, and made them overload the Sycorax ship by recreating the whole of Earth with the ship's magma-sculptor, causing it to explode. (COMIC: The Widow's Curse)