Assorted thoughts on "The Three Doctors"

I swear I saw bits and pieces of old Doctor Who reruns when I was growing up, and I have vague memories of the Third Doctor and Bessie - vague enough that I would never be able to actually identify an episode that I've seen before.
Jo is sort of blandly competent in this, without standing out in any way. The Brigadier is at his most buffoonish.
It's a shame William Hartnell's health prevented him from playing a larger role in the story, but you do what you can with what you have.
The "telepathic conference" effect (if you can call it an effect) was charmingly effective.
I also rather liked the blobby creatures, and whatever they used to dress the sets in the antimatter universe. That translucent red stuff has a visceral quality that enhances the overall...shoddiness.
Nice quarry, too.
Now, on to Omega. There's "over the top," and then there's this guy. He's an old-school supervillain at his core, with shades of Doctor Doom (and I'm not just talking about the mask). Despite being very one-note, his backstory is interesting, and has a very old-school sci-fi feel.
Also...Omega is trapped in a world that he's essentially wished into existence. Where have I heard that before...?