The nine-episode event series/fifth season of Prison Break aired in the spring of 2017, about seven years after the fourth and (at the time) final season. This series came about when Wentworth Miller and Dominic Purcell began working together on The Flash and reminiscing about their days on Prison Break and that it would be nice to revisit that story. There was already an unaired storyline from season 4 that showed events that occurred during the time jump to the last scene and set up Michael faking his death, and this series took things from there.
The series starts with Lincoln receiving a picture that intimates his brother is still alive and (again) in prison. He discovers that Michael is indeed in a prison in Yemen, under an assumed name, and is considered an ISIS-sympathizing terrorist. As was the case for almost every season of the show, not everything is what it seems, and for having just nine episodes, the show is packed with twists. Some of the twists worked, and some were kind of silly. The series does retcon the date of Michael's death listed on his headstone, having him die in 2010, most likely to match up with the seven-year break between the original series finale and the event series.
This series serves as a way to give the fans a better ending for the main characters. It also blends in characters from the original series, both in large and small roles, although not every character from the original series appeared in the event series. There are also many new characters, mainly from the Yemen prison part of the story. Given the limited run of the series, there was not a lot of time to develop any of the new characters in detail, but the show managed to give them some depth. The main cast for the event series included Wentworth Miller, Dominic Purcell, Sarah Wayne Callies, Paul Adelstein, Rockmond Dunbar, Robert Knepper, Amaury Nolasco, Mark Feuerstein, Inbar Lavi, and Augustus Prew.
The Blu-Ray set is a three-disc set. The only extra is an approximately 11-minute making-of feature on how the series was put together. It was okay, but not as extensive as the bonus materials included in the prior seasons. Given, however, that TV series on physical media (especially on Blu-Ray) have sharply declined since the original series went off the air, it is not all that surprising that the extras are very light. The Event Series was released on Blu-Ray separately, but it is easier to find on DVD (especially in the US). The easiest way to get it on Blu-Ray is by getting one of the complete series sets that includes it.
Overall, it is a good series that brings back popular characters and gives them more of a "happy" ending than they got in the original series. I do not think it as good as the original series, at least not the first couple of seasons, but I do think if you enjoyed the original series, you will likely enjoy this. And, it does give the series a full four-season episode count, essentially replacing the episodes that were lost due to the season-three writer's strike.