It's no secret that Omega is my favorite Doctor Who villain. I love the angst and the lore and the anger and the irony and all of the juicy, juicy drama tied up with him. The Three Doctors is one of my top stories in the entire show. Arc of Infinity has Omega. Time's Crucible, in all it does, finds time to stick Omega in there. The Infinity Doctors- part of a previous anniversary- gets my vote of quality in large part due to the excellent AU Omega content. And this story is no different. It plays further into Omega's madness and backstory than ever before. It presents all the possible ways that Omega's history could've played out, and it tells us a little of the Gallifreyans before Omega and Rassilon came to power.

All of the characters in this are excellent, and everything comes together in shocking and unexpected ways. I can highly recommend this audio to anyone looking for a good Big Finish to start with. It's untied to any audio story arcs going on, and it's free on Spotify, and it's completely excellent.
And it is a crime that Nev Fountain has written so little else.