3 Sycorax Warriors appeared at the Pandorica
These Sycorax appeared at the Pandorica to go against the Doctor and put him inside it. They formed an Alliance with Enemies like The Daleks, Cybermen, Judoon, Autons, Silurians, Sontarans and many more. They helped put him inside it and then the Whole Universe had been destroyed with every single Alien.
They have appeared in Series 5: The Pandorica Opens.