B.S.O.D.

"B.S.O.D." is the 1st episode and season premiere of the fifth season of the American television drama series Person of Interest. It is the 91st overall episode of the series and is written by executive producer Greg Plageman and Tony Camerino and directed by executive producer Chris Fisher. It aired on CBS in the United States and on CTV in Canada on May 3, 2016.

The series revolves around a computer program for the federal government known as "The Machine" that is capable of collating all sources of information to predict terrorist acts and to identify people planning them. A team follows "irrelevant" crimes: lesser level of priority for the government. However, their security and safety is put in danger following the activation of a new program named Samaritan. In the episode, the team must protect the Machine as it starts losing power after the events of the previous episode. The title refers to "Blue screen of death", an error screen displayed on Windows computers following a fatal system error.

According to Nielsen Media Research, the episode was seen by an estimated 7.35 million household viewers and gained a 1.2/4 ratings share among adults aged 18–49. The episode received very positive reviews from critics, who praised the writing, character development and action scenes.