There's so much Big Finish to cover that I wouldn't even do a top ten. It really depends on which Doctor and/or companion each fan prefers. So with that in mind, I've broken it up by Doctor and special series. A few quick notes: CC refers to the "Companion Chronicle" range where one or two companions narrate the story along with one or two guests in a pseudo audiobook format; LS refers to the "Lost Story" range where either full script or general outline of a story that was original intended for the series has now been adapted into audio format; NA refers to novel adaptation. Also, when I refer to a companion in those two formats, it's that actor (or actors) who narrates.
First Doctor
1. Home Truths (Sara Kingdom CC that starts off a fantastic trilogy and works brilliantly on its own)
2. Farewell, Great Macedon (Ian/Susan LS that features Alexander the Great)
3. The Time Museum (Ian CC reflecting on the past)
4. Return of the Rocket Men (Steven CC, loose sequel to...)
5. The Rocket Men (Ian CC)
Maureen O'Brien has also returned and her best CC is
The Suffering (which also features Peter Purves).
Second Doctor
1. Dying Light (Jamie/Zoe CC, part of a loose trilogy across Doctors that can be listened to on its own)
2. The Forbidden Time (Jamie/Polly CC)
3. The Memory Cheats (Zoe CC, second part of a quadrilogy but can be listened to on its own)
4. The Rosemariners (Jamie/Zoe LS)
5. Echoes of Grey (Zoe CC, first part of aforementioned quadrilogy)
Deborah Watling has also returned, but I've only listened to one of her stories,
The Great Space Elevator, and it wasn't very good.
Third Doctor
1. Old Soldiers (Brig CC)
2. The Doll of Death (Jo CC, goes a long way to making me like Jo who I otherwise abhorred)
3. The Last Post (Liz CC, last story Caroline Johns recorded and features Liz's mum)
4. The Mega (Jo/Mike LS, globetrotting conspiracy adventure)
From here, the quality drops a bit for me but I haven't listened to all of The Third Doctor stories. I know a lot people aren't a fan of it, but I love the BBC-produced
The Paradise of Death, which features Jon Pertwee, Lis Sladen and Nicholas Courtney, recorded in 1993, the first of two stories they did prior to Pertwee's death. The other,
The Ghosts of N-Space, is also not well regarded, including by me.
John Levene has also returned but for only one story and was critical of his experience and probably won't return. I haven't listened to the CC,
Council of War.
Fourth Doctor
1. The Ghosts of Gralstead (Starring Tom and Louise and written based on a modern story idea by Philip Hinchcliffe)
2. The Foe from the Future (LS starring Tom and Louise, based on a story from Robert Stewart Banks)
3. Luna Romana (Romana II CC, also features Romana I & III, but no Mary Tamm, no foreknowledge of Romana III is needed)
4. The Justice of Jalxar (Starring Tom and Mary, guest starring Jago & Litefoot)
5. The Romance of Crime (NA, starring Tom, Lalla and John)
Tom Baker resisted for a number of years to do Big Finish, but is now finally onboard. Instead of doing standalones, or the current model, trilogies like Peter, Colin and Sylvester, Tom's stories are season based. So far there have been three with Louise, one with Mary (before she passed away), and two with John (one with Louise, one with Mary). Next season will be with Lalla and John.
Fifth Doctor
1. Spare Parts (Starring Peter and Sarah, Cybermen origin)
2. Rat Trap (Starring Peter, Sarah, Mark and Janet)
3. Prisoners of Fate (Starring Peter, Sarah, Mark and Janet)
4. The Emerald Tiger (Starring Peter, Sarah, Mark and Janet)
5. Equilibrium (Starring Peter, Sarah, Mark and Janet)
There's a long run of Nyssa/Tegan/Turlough that's set immediately after The Black Guardian trilogy and features an older Nyssa. Most stories are fairly standalone, except the most recent trilogy which is set in E-Space.
For several years, The Fifth Doctor and Peri were accompanied by an ancient Egyptian princess, Erimem, but with the exception of a few stories, the character was never fully realized and the stories were often of average fare. Best story:
The Kingmaker.
Like Tom, Matthew Waterhouse resisted for a long time but finally returned last year in a two-story boxset with Peter, Sarah and Janet. Both stories are very good. Like The Sixth Doctor, Mel, and Jo, the stories go a long way in redeeming the character.
Sixth Doctor
1. The Holy Terror (Starring Colin, features comic strip original character, Frobisher, voiced by Robert Jezek)
2. ...ish (Starring Colin and Nicola)
3. Voyage to Venus (Starring Colin with guest companions of Jago & Litefoot, swept up from their ongoing series)
4. Year of the Pig (Starring Colin and Peri)
5. The Marian Conspiracy (Starring Colin, features the first appearance of Maggie Stables as new companion, Evelyn; not Evelyn's best story, but this where one should start)
Until recently, there hasn't been very many adventures with Mel (with Sixth or Seventh) because Bonnie Langford lives in the US, but now Big Finish has been able to arrange recording a number of stories with both Doctors. Best so far is
The Wrong Doctors, which is a pseudo introduction story for Mel. I can't comment, but I've read that it doesn't contradict the novel
Business as Usual.
Seventh Doctor
This is a little trickier because some of the best Seventh Doctor stories are part of the ongoing adventures with new companion Hex (alongside Ace) and get pretty arc-heavy towards the end. I'll leave out the arc-heavy stories, but will mention a few standalones with Hex that can be listened to as an introduction.
1. Live 34 (Starring Sylvester and Sophie, featuring Hex, uses clever gimmick of being told entirely by broadcast)
2. Flip-Flop (Starring Sylvester and Bonnie, uses fun gimmick of listening to the story in two different orders, i.e. disc 1 or 2, followed by the other)
3. Night Thoughts (Starring Sylvester and Sophie, featuring Hex)
4. The Harvest (Starring Sylvester and Sophie, Hex's introduction)
5. Master (Starring Syvester, featuring Geoffrey Beevers as The Master)
Eighth Doctor
This is even trickier. Instead of listing top stories, I'll just give a quick run down of the three (soon to be four) different Eighth Doctor tracks one can go down.
1. Adventures with Charley Pollard. Starts with
Storm Warning and is fairly standalone (major highlights include the aforementioned story,
The Chimes of Midnight, and
The Seasons of Fear). About halfway through, there's a major shift in storyline after the climax of the 40th anniversary story
Zagreus (with a ton of familiar voices), and two stories later, another companion, C'rizz, is added to the mix. A lot of fans didn't like this new direction, but for the most part, I really enjoyed it. If you choose to jump to
Zagreus, I would recommend at least listening to
Storm Warning,
The Chimes of Midnight,
The Seasons of Fear and
Neverland first.
2. Adventures with Lucie Miller. Set sometime after Charley and C'rizz, starts with
Blood of the Daleks. Fairly standalone until the final series (unlike the Charley/C'rizz run, Lucie stories were produced by series) with the exception of some background story arcs which are pretty easy to pick up on.
3. Dark Eyes. Set sometime after Lucie Miller and spoils important details of the conclusion. If you don't care, jump right in. Instead of series,
Dark Eyes is four sets of four-story boxsets. Features two different companions, Molly O'Sullivan and Liv Chenka (a one-off character from a Seventh Doctor story but doesn't need to be listened to) that come and go for different reasons. Also features a new actor as The Master.
4. Doom Coalition. Set after
Dark Eyes and continues the boxset model and begins in October. Second set will feature River.
5. (So I lied, I just remembered two exceptions) There's a trilogy of stories featuring Mary Shelley, the author, as The Doctor's companion with no explanation as to how she became his companion. There's an anthology of short stories called
The Company of Friends, which feature companions from the comic strips and novels, including Mary Shelley's first encounter with The Eighth Doctor, and a one-off with Bernice Summerfield.
There's also a few Doctor-less (or mostly Doctor-less) ranges that I would highly recommend:
1. Jago & Litefoot. Started off as a Companion Chronicle,
The Mahogany Murderers, there have been now nine (soon to be ten) series of four stories with Trevor Baxter and Christopher Benjamin returning to their roles from
The Talons of Weng-Chiang. Also brings back Conrad Asquith as Quick, now a sergeant. Highly, highly recommended.
2. Gallifrey. Political and time shenanigans on Gallifrey, starring Lalla, Louise, and John (as both K-9's), features Lynda Bellingham reprising the role of the Inquisitor (now called Darkel), and a few other familiar voices pop up from time to time. A lot of fun, from beginning to end (and it's returning, again), although some fans didn't like some of the more recent stories
.
3.
I, Davros. Four-story box set, origin story of Davros, told in the manner of
I, Claudius, Terry Molloy reprises the role and the fourth story features Peter Miles returning as Nyder.
4. Unbound. This was a short series of "What if...?" stories Big Finish did in its early years which had mix results. I've only listened to two of them and I would highly recommend at least one of them:
Sympathy for the Devil. Stars David Warner as The Third Doctor who, after his regeneration, is sent to 1997 Hong Kong instead of 1970's UNIT and we see the ramifications of The Third Doctor not joining UNIT. Also stars Nicholas Courtney as the Brigadier and David Tennant as an asshole colonel (this was recorded prior to The Tenth Doctor).
5. Bernice Summerfield. The character originated in novels. Big Finish started doing audios with her before doing
Doctor Who as a means to prove to BBC that they were fully capable of doing the job right. Started in 1998, the series is still going. Stars Lisa Bowerman, who appeared as one of the cheetahs in
Survival, and is one of the main directors for Big Finish. Lisa also has a recurring role in the
Jago & Litefoot range as a different character. One of the supporting characters, Braxiatel, also shows up in
Gallifrey.
*whew*
Sorry, that went on far longer than I initially intended, but as I said at the beginning, that there's so much to Big Finish, that it's near impossible to recommend just
ten.
But if I had to...
1. Spare Parts (5th, Nyssa)
2. The Chimes of Midnight (8th, Charley)
3. The Holy Terror (6th, Frobisher)
4. Home Truths (Sara Kingdom CC)
5. Live 34 (7th, Ace Hex)
6. Old Soldiers (Brig CC)
7. The Doll of Death (Jo CC)
8. Farewell, Great Macedon (Ian/Susan CC)
9. The Time Museum (Ian CC)
10. The Silver Turk (8th, Mary)
Mind you, that's after removing arc-heavy stories.
Wikipedia has a
very good article that lists all of the stories, broken down by range. However, be warned that one of the columns lists characters and species that appear in the story, sometimes which were originally intended to be a surprise.