Vinvocci

The Vinvocci were the race that created the Immortality Gate.

Biology
The Vinvocci were green, spiky humanoids. They resembled the Zocci, but were taller and green.

Technology
The Vinvocci used shimmers to appear as Humans. These devices, disguised as a wristwatch, allowed Rossiter and Addams to work for Joshua Naismith undetected. Apparently the device is uncomfortable to use and the name of the device implies that the cloaking process involves light.

History
In 2010, A salvage team, consisting of Rossiter and Addams, arrived on Earth in order to find the Immortality Gate. The Gate had been reactivated by humans, which sent out a signal and attracted the pair. They infiltrated the company of Joshua Naismith, under the guise of two Human scientists. They were trying to repair the Gate, but the Master stopped their plans by using it himself. (DW: The End of Time)

Behind the Scenes

 * In the Doctor Who Confidential episode for DW: The End of Time- Part 1, Russell T Davies briefly suggests that the Vinvocci and Zocci are in fact related species.''
 * This is reminiscent of the Abzorbaloff's dislike for being confused with a Raxacoricofallapatorian.