The Eternal Dalek was reduced to dust and stone along with the Supreme Dalek and the Drone Dalek following total event collapse. This timeline would later be undone by the Doctor, leaving the Eternal and the other Daleks in their proper place in time, never knowing of the cracks. (TV: The Big Bang).
Doctor Who Confidential revealed that the name of this Dalek was provided by Steven Moffat in a "naming session" with Mark Gatiss. Neither came up with a meaning for the name, but Moffat opined in Confidential that he thought that the functionality of the Eternal would one day become critical to a story. The Dalek Handbook quotes Gatiss as saying "its exact function is a total mystery, but it's probably something to do with the Progenitor device and the continuation of the race."
The Brilliant Book 2011 calls attention to the fact that the Eternal Dalek's colours are usually found on the most dangerous animals in the wild.
The Eternal Dalek is notably the only one of the five Progenitor Daleks to have black orbs on its design rather than grey ones.
The package the toy figure of Eternal refers to the Dalek as 'The Eternal'.
The Eternal dalek was one of the only daleks not personally in City of the Daleks (video game), the other was possible, the Scientist dalek, as most of the drones resemble scientists, however there was one in a room in where there was no light to identify, and one of the only few you can't fight, the other being the strategist, however an image of what both it and the scientist would look like in-game. [statement unclear]
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