A '''companion show''' is a non-fiction show intended as a complement to another show, usually fiction. You usually get one episode of the companion show for each episode of the main show. There are two main types of companion show, although there is some overlap between the two.

The first is a {{documentary}}-style show, offering a look behind-the-scenes of the main show, showing how special effects are done, and with the cast and crew discussing the characters, plotlines, sets and costumes, and anything else the producers of the show want to highlight. The style is similar to the sort of featurette you might get on the DVD of the series.

The second type is a more fan-based show. The presenters will almost always be telegenic fans or popular former actors or runners-up of the main show who transitioned to hosting, and discuss the latest episode, highlighting their favourite and least favorite moments and characters, as well as commenting on the unfolding storylines and possible theories of how the plot will develop. Expect some audience involvement, by e-mail, text message or telephone. Some shows have a studio audience to lend their comments. In the United States, this practice was popularized by Creator/{{AMC}}, who introduced such a program as a lead-out for its highly-popular series ''Series/TheWalkingDead'' beginning in its second season. Other cable series have since followed in their footprints.

Main/RealityTV shows sometimes have companion shows as well, although usually some of the elements of companion shows are included in the main show.

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!!Examples

* In the United Kingdom, ''Series/{{Heroes}}'' has both types of show. ''Heroes Unmasked'' is a documentary (with voice-over by Anthony Head), focusing on different elements (usually different characters) of the show each week, and broadcast after each episode on [[Creator/TheBBC BBC2]]. ''Heroes: The Official Radio Show'' is a fan-based radio show (with podcast), with fan e-mails read out (and some fans phoning in).
** For season two, G4 aired an American companion show that, over its run, managed to get most of the cast on. It was called ''The Post Show''.
* ''Series/DoctorWho'' has two companion shows. ''Series/DoctorWhoConfidential'' is a behind-the-scenes show, and ''Totally Doctor Who'' is a children's show, with a mixture of things including games, behind-the-scenes segments and reviews of the episode; perhaps most notably it was through ''Totally'' that the series three animated serial ''The Infinite Quest'' was shown (with voice acting from Anthony Head). As on October 2011, both shows have been cancelled. In 2014, a much shorter version of ''Confidential'' was introduced on the red button channel, called ''Doctor Who Extra''.
* ''Series/{{Torchwood}}'' has its own version of ''Doctor Who Confidential'' with much shorter episodes, known as ''Torchwood Declassified''.
* ''Series/{{Hustle}}'' has ''Series/TheRealHustle'', a documentary series which focused on demonstrating common scams on members of the public, and explaining how people can protect themselves. It is so distinct from ''Hustle'' that it is fairly easy to watch in its own right.
* ''Series/StrictlyComeDancing'' has a weekday [[Creator/TheBBC BBC2]] show called ''Series/StrictlyComeDancing: It Takes Two'', with interviews and behind the scenes footage, among other things. It also features some truly awful puns in its captions. Such as (brace yourself): "The Penny's Dropped" for Penny Lancaster-Stewart after she recently went out of the competition.
* The second season of ''Series/TwentyFour'' in the UK had ''Pure 24''.
* ''Series/{{Lost}}'' in the UK had ''UK Lost'' (a podcast) while Season 2 was being shown on Channel 4. Presented by Ian Lee and others, it was the fan-based variety of show, including, among other things a discussion of fan theories e-mailed in, including more than a few Main/EpilepticTrees. It also provide updates on ''ARG/TheLostExperience'' the AlternateRealityGame. When the show moved to Sky, the name changed to ''The Lost Initiative''.
* ''Series/BigBrother'' had ''Big Brother's Little Brother'' which features, you guessed it, interviews and behind-the-scenes footage. On top of that there was ''Big Brother's Big Mouth'', which was more of a ''Talking Dead''-type show with celebrity guests and viewer contributions. When the show moved from Creator/Channel4 to ChannelFive, they were replaced by a new show, ''Big Brother's Bit On The Side'' (also accompanied by its own Saturday-night spin-off, ''Big Brother's Bit on the Psych'', which focused on psychological analysis of the goings-on in the House, and was a remake of the similar ''Big Brother: On the Couch'' aired during series 8)
** The Canadian version of the show started the ''Big Brother Side Show'' in season 2, where previous houseguests Peter and Gary talked about the events in the the house and interview the most recent evictee.
* Trope-within-a-trope: companion shows typically have punning titles: ''Strictly Come Dancing: It Takes Two'', ''Dancing on Ice: Defrosted'', ''Space Cadets: The Satellite Show'', ''Hell's Kitchen: Extra Portions'' and so forth. Naturally there are exceptions: ''Dancing on Ice Exclusive'' was particularly uninspired example.
* ''The Xtra Factor'' for ''Series/TheXFactor''
* ''Britain's Got More Talent'' for ''Series/BritainsGotTalent''
* ''The Apprentice - You're Fired'' for the UK's ''Series/TheApprentice''
* ''I'm a Celebrity, Get Me Out Of Here! '''Now!''''' for ''[[CaptainObvious I'm A Celebrity, Get Me Out Of Here!]]'' (since re-named ''Extra Camp'')
* After Creator/{{AMC}}'s attempts to lead-out of ''Series/TheWalkingDead'' with reality shows failed, ''The Talking Dead'' with Chris Hardwick discussing the episode afterwards was created. After it did unexpectedly well, AMC decided to have the last episodes of ''Series/BreakingBad'' have another Hardwick-hosted show called ''Talking Bad'' lead out of that. In 2017, after ''The Walking Dead'' wrapped up for the season, they decided to keep the show around as ''Talking with Chris Hardwick'' rather than put it on hiatus until ''Series/FearTheWalkingDead'' returned. This show is more of a straightforward interview show with a single guest.
* Parodied by ''Series/TheLateLateShow with James Corden'' with ''Talking [[Series/TheMentalist Mentalist]]'', where James and his guests discussed the rerun of said show that CBS had just aired (after Creator/DavidLetterman's ''Late Show'' ended, CBS aired reruns of primetime dramas in its timeslot as filler prior to the premiere of ''Series/TheLateShowWithStephenColbert'').
** It even got a companion show of its own, ''[[ShapedLikeITself Talking Talking Mentalist]]'', where a panel talks about the last episode of ''Talking Mentalist''.
*** Chris Hardwick himself made a cameo when it became ''Talking Series/HawaiiFive0''. Corden ended up returning the favor by actually appearing on the aforementioned ''Talking'' on April 30, 2017.
* ''Series/{{Vikings}}'' has ''Real Vikings'', a documentary series that focuses on outlining the real-life history and folklore that inspired the historical drama.
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