#49 Dark Shadows: The House by the Sea

My Randomoid Selectortron leaves Davros to commence his trial and lands me at...

Dark Shadows: The House by the Sea

Starring: Colin Baker as Gerard Conway, also delivering other characters' dialogue in narration
Format: Mostly single-actor narrated single CD (or download) with no episode breaks.
Silly? Yes, in a campy horror-movie way.
Standalone? This is the first part of Big Finish's 1973 Dark Shadows arc. Its ending points forward into subsequent stories and there are many rewards for knowledge of TV Dark Shadows events. Aesthetically, The House by the Sea does work as an experience in itself, if you don't mind something that's obviously a small step in a greater narrative. 
Recommended? Yes, unless you dislike hearing Colin Baker's voice.

My reactions to this story contain spoilers for it, and possibly mild spoilers for the rest of the 1973 arc.

#48 I, Davros: The Davros Mission

One short random selection away from the slow recovery of Dalek-ravaged Earth comes...

I, Davros: The Davros Mission

Starring: Terry Molloy as Davros
Format: Full-cast one-CD-length download
Silly? No
Standalone? This is a bridging story between Revelation of the Daleks and I, Davros, but the main action of the story is its own incident.
Recommended? Yes

My reactions to this story contain spoilers for it and possible spoilers for the beginning of I, Davros.

#47 Doctor Who Bonus Releases: An Earthly Child

From a lonely mispronounced-Albanian-vampire-infested beach, my Randomoid Selectortron dematerializes. When it next appears, I emerge at...

Doctor Who Bonus Releases: An Earthly Child

Starring: Paul McGann as the Doctor and Carole Ann Ford as Susan
Format: One full-cast CD (or download) with no episode breaks
Silly? No
Standalone? Can function standalone, but also fits into the fourth season arc of Eighth Doctor Adventures. Prior awareness of The Dalek Invasion of Earth is helpful.
Recommended? Yes

My reactions to this story contain spoilers for it and for the final arc of Big Finish's Eighth Doctor Adventures.

#46 UNIT: Snake Head

My Randomoid Selectortron leaves the past of Skaro to take me to...

UNIT: Snake Head

Starring: Siri O'Neal as Emily Chaudhry and Nicholas Deal as Robert Dalton  
Format: One full-cast CD (or download) with no episode breaks.
Silly? Flirty banter comes into play in places where it shouldn't.
Standalone? Yes.
Recommended? No, but not necessarily to be skipped if listening to the series as a whole.

My reactions to this story contain spoilers for it and for the rest of the first UNIT audio season.

#45 I, Davros: Innocence

On a day when I've decided to listen to more stories than usual, my Randomoid Selectortron has coincidentally taken me to two stories about stories. Let's see where it goes next...

I, Davros: Corruption

My understanding of I, Davros is that it's a chronologically ordered "biography" of pre-Genesis of the Daleks Davros and isn't meant to be listened to out of order. I am therefore activating a manual override and selecting:

I, Davros: Innocence

Starring: Rory Jenning as Davros and Terry Molloy as older Davros
Format: One full-cast CD (or download) with no episode breaks
Silly? No
Standalone? The episode does not have a cliffhanger but is openly just the first of several
Recommended? Yes

My reactions to this story contain spoilers for it, and possibly for related stories such as Dalek Empire and Davros.

#44 Doctor Who: 1001 Nights

My Randomoid Selectortron flits across possibilities and arrives at the certainty of...

Doctor Who: 1001 Nights

Starring: Peter Davison as the Doctor and Sarah Sutton as Nyssa
Format: Two full-cast CDs (or download) of four half-CD episodes
Silly? Varyingly, as 1001 Nights is partially an anthology of shorter stories varying in tone. 
Standalone? Yes.
Recommended? Yes. The third short story is weak, but it still manages to contribute to the overall whole.

My reactions to this story contain spoilers for it.

#43 Doctor Who Unbound: Auld Mortality

My Randomoid Selectortron departs the snowed-in boarding school and transports me randomly to...

Doctor Who Unbound: Auld Mortality

Starring: Geoffrey Bayldon as the Doctor and Carole Ann Ford as Susan
Format: One full-cast CD (or download) with no episode breaks
Silly? Silly elements exist as in-universe fiction to serve greater plot purposes
Standalone? Yes
Recommended? Highly, to anyone with any interest in Doctor Who audio at all.

My reactions to this story contain spoilers for it.

#42 Doctor Who: Winter for the Adept

My Randomoid Selectortron untangles itself from the Marian conspiracy and transports me randomly to...

Doctor Who: Winter for the Adept

Starring: Peter Davison as the Doctor and Sarah Sutton as Nyssa
Format: Two full-cast CDs (or download) of four half-CD episodes
Silly? More so than the average Doctor Who, but not quite to the point of being primarily a comedy release.
Standalone? Yes.
Recommended? Yes due to having a low price point, but Winter for the Adept is not quite top-shelf Doctor Who.

My reactions to this story contain spoilers for it.

#41 Doctor Who: The Marian Conspiracy

The werewolves are tied to the Earth, but my Randomoid Selectortron goes where it will, departing from the pack to take me to...

Doctor Who: The Marian Conspiracy

Starring: Colin Baker as the Doctor and Maggie Stables as Evelyn Smythe
Format: Two full-cast CDs (or download) of four half-CD episodes
Silly? There are farcical elements; compared to TV Doctor Who, there are more than The Aztecs but fewer than The Romans.
Standalone? Yes. Evelyn is introduced and joins the Doctor, but no specific plot arcs for her begin here.
Recommended? Yes.

My reactions to this story contain spoilers for it, and mild spoilers for subsequent Evelyn Smythe audios.

#40 Doctor Who: Loups-Garoux

The Randomoid Selectortron departs the grim tableau of medieval Wallachia and travels to...

Doctor Who: Loups-Garoux

Starring: Peter Davison as the Doctor and Mark Strickson as Turlough
Format: Two full-cast CDs (or download) of four half-CD episodes
Silly? In the ways that a soap opera tends to be.
Standalone? Yes.
Recommended? Yes.

My reactions to this story contain spoilers for it and the Doctor Who audio Dreamtime.