The Library of Alexandria is a Doctor Who audio presentation from Big Finish. It is another episode in the range known as The Companion Chronicles and is written by Simon Guerrier. William Russell reprises his role as Ian Chesterton and has Susan Franklyn helping out as an ancient mathematician and philosopher in 5th Century Egypt known as Hypatia. Lisa Bowerman directed this particular episode.
This is a story in the era of the First Doctor, as played by the late William Hartnell. The Doctor and his companions have stopped off in 5th Century Alexandria, which is apparently the site of a renowned ancient library. What historians may not have known is that ancient alien sea creatures are also lurking around. It is Doctor Who after all.
There is not a lot to say here. I didn’t find it to be all that memorable. William Russell is fine as Chesterton and does a decent enough Hartnell impression. This is a little unusual in that it turns out not to be the purely historical episode as was known in this particular era. Guerrier writes a competent enough story here, but nothing much to say beyond that.