Lady Cassandra O'Brien.Δ17 (or more simply Lady Cassandra) was someone encountered by the Ninth Doctor 5 billion years into the future while she was on Platform One to watch the Earth's destruction. She had extended her life by a series of 708 surgeries.

This article, Cassandra O'Brien.Δ17, is a stub and needs more content. You can assist the WikiSciFi by expanding this article as much as you can.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.