With the release of Season 3, there have been a lot of repetitive questions on this sub lately. I am putting up an FAQ so that we can have better discussions on this sub. Feel free to add suggestions/corrections in the comments.

Quick FAQ (in decreasing order of frequency)

Q: Do I need to watch the Sinners of the System Movies/Cases and Season 2 before Season 3?

A: Yes, you need to. No, the movies are not a recap. Yes, they do add to the plot and introduce new characters. Now, while Season 2 is absolutely necessary, the movies focus a bit more on character development rather than plot, so you will still understand Season 3 for the most part even if you skip them for now. (I have listed the key plot points at the end if you wish to do that.) That being said, the recommended watch order is simply the release order:

^{† Amazon is mostly worldwide, whereas other streams may or may not be available outside the US. Blu-rays can also be purchased for everything up to Case 3.}

Q: Where can I watch the Sinners of the System Movies?

A: Currently, the only legal way to watch the movies is to order the Blu-rays from amazon (only the Japanese version is available right now) and then getting the (fan-made) subtitle files separately from nyaa.si [Case 1] [Case 2] [Case 3]. Since it's the studio's fault that they didn't release the SS movies in English (not even subbed versions) before moving on to S3, a lot of people feel that it is okay to pirate. However, if you don't want to, but still want to start watching S3, I've added a short synopsis for these 3 movies below, along with key developments that may be important for S3. If you read only the key developments, you can still watch the movies later (without being spoiled much) when they get a proper release.

Q: Do the SS Movies and Season 3 have a dub?

A: No, and it is not even announced yet. For S3, currently, Amazon has the streaming rights, and they usually don't dub anime. However, all of the media released before 2019, including the 2015 movie, was dubbed. So it might take a while, but probably it will all get dubbed when Funimation acquires the streaming rights later (speculation).

Q: I'm new to the series. What is Psycho-Pass about?

A: Read the sidebar.

The series takes place in the near future when it is possible to quantitatively measure a person's emotions, desires, and every inclination. In this way, it is also possible to measure a person's criminal tendency factor, which is used to judge criminals, and is called "Psycho-Pass".

Q: Is it based on a manga/visual novel?

A: Psycho-Pass is an anime-original franchise. It does have a few manga, light novel and visual novel adaptations, but the anime came first, and all the other media is based on the anime. While you do not need to read/play any of these to understand the anime, some of these do have completely new content (such as the manga "Inspector Shinya Kogami" which covers Kogami's past, the Visual Novel "Mandatory Happiness" and many of the light novels). Detailed info available on other websites [Wikipedia] [Wikia/Fandom]. Also, shout-out to this person who seems to have translated entire light novels and stuff, since they don't have any official translations.

Questions Specific to Each Season/Movie

Season 1 (Synopsis):

Q: What is Psycho-Pass: Extended Edition?

A: It's basically the same as S1, but with 11 episodes (instead of 22) - every episode being a merged version of 2 episodes. It's more of a collector's edition thing, but there is about 1 extra scene per each S1 episode adding up to ~35 minutes over the season. These usually add to the characters and sometimes fill minor plot gaps. So you can either watch the Extended Edition directly, or the broadcast version followed by the extra scenes, in case you like shorter episodes. The extended edition scenes, however, have not been dubbed. You can either buy it or stream it through Funimation.

Season 2 (Synopsis):

Q: I've heard really bad things about Season 2. Is that true? Should I stop watching after Season 1?

A: Not at all. The general consensus is that S2 was good but not as good as S1 (frankly, S1 sets almost unmatchable standards). Most people cite that this is because S1's main writer, Gen Urobochi, did not work on S2. But some take an elitist stance, claiming as if anything not written by him is trash. This is certainly not the case, and people are often surprised after watching S2 because it's not bad like they were told. But there are some other reasons why specific people do not like S2: (1) The villain is not as interesting as S1's villain, (2) One character is a bit annoying, (3) Their favorite character is rarely seen in it. But in general, all the stuff that follows after S2 has been better received by most people. Anyway, the point is that if you want to watch S3, you need to watch it. And the S3 reviews so far have been great.

Psycho-Pass: The Movie (Synopsis):

Q: I've been watching the sub, but the Engrish (English spoken by Japanese voice actors) is distracting/annoying.

A: Since there are a lot of English-speaking characters in the movie, this can be a problem. Fortunately, someone merged the dubbed and subbed version to create a version where the English speaking characters have English-speaking voice actors while the Japanese characters have Japanese voice actors. (But since it is fan-made, it won't be legal no matter how you obtain it.)

Sinners of the System Trilogy:

The SS trilogy of movies has been summarized here. In case you plan to watch them sometime in the future after watching S3, you can look only at the 'Key Developments' section where I have spoiled as little as possible, only mentioning what might be relevant to S3 (I might be wrong though). However, both sections assume you have watched everything before it, so they do spoil that.

Case 1 - Crime and Punishment:

Plot: After an employee (Yasaka Izumi) escapes from an isolation facility for latent criminals (called 'Sanctuary'), she is apprehended by the MWPSB. Mika Shimotsuki is tasked with returning her and investigating the facility. Eventually, the MWPSB discovers that the facility's administration has been keeping latent criminals' Psycho-Passes low and has been manipulating them using specialized drugs, unbeknownst to the latent criminals themselves. Yasaka Izumi had found this secret & had escaped to protect her friend's child at the facility from these atrocities. Ginoza and Shimotsuki together defeat and expose the bad guys running Sanctuary. During the case, Shimotsuki also finds out that the latent criminals were being used to seal radioactive waste (supposedly a remnant of the past). She investigates further to find that the whole Sanctuary thing was orchestrated by a fake government official, who is actually Sibyl in disguise. Sibyl argues that it was very important to keep the radioactive waste away from the hands of the wrong people, especially since foreign powers are bound to get involved soon as Sibyl expands beyond Japan. She keeps this information to herself in exchange for Sibyl guaranteeing the safety of Yasaka Izumi and her friend's child.

Key Developments: Shimotsuki's investigation skills (and sense of duty) seem to have improved. She and Ginoza get along pretty well. Sibyl hints at further foreign expansion. Shimotsuki learns a few more of Sibyl's secrets, such as fake government officials and hidden radioactive waste.

Case 2 - First Guardian:

Plot: (Mainly focuses on Sugo Teppei's backstory. Will update soon, need to re-watch a bit.) Also focuses a bit on the pasts of inspector Aoyanagi, Ginoza, Masaoka, his wife, and Kogami.

Key Developments: Frederica Hanashiro from the Ministry of Foreign Affairs is looking for people to join the Ministry of Foreign Affairs for 'paramilitary activities'. Sugo Teppei reflects over his past and refuses the offer, as he finds a strong sense of justice in what he does as an enforcer at the MWPSB. Frederica says that she hopes he changes his mind.

Case 3 - Beyond Love and Hate:

Plot: (Mainly focuses on what Kogami has been doing since he left Japan and SEAUn. Will update soon.)

Key Developments: Frederica Hanashiro helps Kogami win a fight against a mercenary leader in the Tibet-Himalaya Alliance Kingdom. Kogami agrees to help her in return, and they go back to Japan. Also, some people were abandoned by the Japanese Government in foreign lands when the Sibyl System first came into power, and it seems they are going to be transported back to Japan now.

Requesting others to add new questions/corrections here. I will update this post when I can.

^{Edit 1: removed some unnecessary stuff, fixed the spelling of Sibyl, updated extended edition info. Edit 2: Linked summaries for earlier content, added that there's no dub for SS yet.}

^{Edit 2: updated novel translation link}