Have you seen Mindwarp? OK, you can skip this one, just know that this is where C'Rizz comes from and you're set to continue the Divergent Universe arc.

Philip has some trappings in his stories, and they can be pretty off-putting. He likes writing over-the-top violence, especially against women, and specifically body horror is almost certainly a fetish of his, given it pops up in BOTH of his TV stories and again here, more violent and horrifying than ever.

I will give him props that none of the women in Mission to Magnus have their bodies taken away from them. No, instead they're all belittled for being misandrists and the big strong men come along to force them to be their wives, which the Doctor approves of. What's the moral here?
But you know what else is in both of his TV stories AND Mission to Magnus? Sil. Big corporate interest, doesn't care about lives if they can't profit him? Yeah, Martin's most well-known villain is a businessman.
He recycles that, here, too.
The Kromon are all bland and uninteresting. They probably had names but I can't tell you any of them. They all blur into one big "what if businessmen were slightly more evil", with a twist of the story being that their slave encampments are built off literal company directives.
I will say that it's a slightly interesting idea. They're based on insects, many of whom have one queen and a bunch of worker drones, so depicting them all as almost mindless drones following the corporate directives could work... if it didn't feel like such a retread.

Had this been Philip's ONLY contribution to Who I'd probably view it more favorably, but every piece of context I glean from his other works just makes it worse and worse.
But don't worry: there is a new and exciting way he found to fumble something interesting.
C'Rizz is the newest companion, and for a lot of the story he's kind of fleshed out. Guy with a heart of gold, wants to help his people, horrified by evil monsters, friend to the Oroog, can't leave anyone in danger... We've seen it before, but it's a good start. What fumbles it for me is the end of the story. C'Rizz talks about having been selected, but neglects to mention anything before that. At the end of the story the Kro'Ka shows up and says "yeah he was a pacifist monk". Why wasn't that IN the story? Have him grapple with it!
The Kro'Ka then starts going off on the Doctor saying that he's the one who weaponised C'Rizz and that he should think on that... So essentially, Philip seems to have been given a character brief and an emotional arc, then pawned it off on the next write because he didn't want it

Speaking of emotional arcs, remember Scherzo? It ends 30 seconds before this one starts? Well, let's just ignore it. No mention of the big revelation of the Doctor and Charley openly admitting they're in love, no, time for a standard Doctor-companion pair. If it weren't for the Kromon going "time travel? What is 'time'?" (and a companion introduction), you'd be forgiven for thinking this was a random extra story set between, say, Minuet in Hell and Invaders from Mars.

In a point in time where Doctor Who is trying to be more experimental and focus on arcs and character more than ever before, Philip Martin paints a dreadfully by-the-numbers story with little memorable about it other than slurping noises.

At its core, Doctor Who is a show about one person who grows, changes, and evolves over the course of century after century, almost always being with at least one Companion. One could even argue that the Companions are a more important aspect to the show than the Doctor themself. Look at the 4th Doctor travelling with Sarah, vs with Leela or with Romana. In a way, the Companion is what defines the Doctor, and the only thing that gives them meaning in a turbulent universe.

Scherzo pushes this beyond the extreme, into the blatant. Subtext is now text. The themes are the story. The Doctor and the Companion are all there is, and without the Companion there would be no Doctor. Without the Doctor there would be no Companion. Both should reasonably have died, but live only because the other demands it.

In this story, toxic codependency evolves to a toxic coexistence. This brutal, heart-rending story is the deepest and most intense examination of the Doctor-Companion relationship that Doctor Who has ever had or ever will have.

If you're going to do a set of character pieces on Doctor Who villains, Davros is an obvious choice. A man willing to destroy his own race is an obvious candidate for a story that dives into his psyche. And Lance does a phenomenal job here.

A theme across this trilogy is that each story is telling two stories: one in the present, with the Doctor thwarting the latest evil scheme, and one in the past, describing the villain's origin. This is partially guesswork on my part, but I assume Master follows the same formula. And, if the trend holds true, then the present section of each story also prominently features the villain going through some sort of mental break which ends with them reaffirming who they know themselves to be.
Unlike the other entries in this trilogy, Davros also has an extra job to do, as there are stories with him set after this (again, assuming Master doesn't try to set up the TV movie), so a good chunk of the story is also devoted to laying tracks to set up Revelation of the Daleks, which I now have to rewatch.
Everything in this story comes together. The ties between capitalism and fascism, the hero worship in modern societies toward monsters of the past, the use of propaganda... just an incredible story which gets to the heart of everything.

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.