- "We're just gonna have to accept that this is the new Jen from now on."
- —Peter Gambi
"The Book of Ruin: Chapter Two" is the sixth episode of the fourth season of , and the fifty-first episode overall. It aired on March 15, 2021.
|Jefferson crosses a line with Lynn. Meanwhile, Anissa shares some important news. Lastly, Tobias makes a surprising move.|
Black Lightning's team is stunned and perplexed. Baron holds his phone before the confused Jennifer so she can see her reflection and she screams. Various tests, including DNA and Grace's animal senses, confirm that Jennifer's appearance may have changed but she is the same person. Anissa is the first to console and accept her sister's new features. Grace reminds Jennifer that what matters is not her outer appearance. Unlike the rest of the Pierce family, Jefferson has a hard time and refuses to hug his daughter.
As Lynn does tests to assure that Jenn would not spontaneously explode, Lynn warns Jenn not to use her powers for a while. Val Seong arrives for her appointment, reminding Lynn that she is to be tested for a cure for ALS. Nervous, Jenn calls herself "JJ", Lynn's niece.
Jefferson questions Gambi whether Jenn is an alien, citing that he has fought beside Superman during the Anti-Monitor Crisis; Gambi is disappointed in his friend's skepticism. As Gambi verifies that Lala did not kill Mayor Billy Black, Tobias Whale has a press conference introducing the DEGs, where he announces that he wants to be mayor of Freeland.
Because Lala is a fugitive, Chief Ana Lopez has gotten approval for "no-knock warrants" to invade homes that she has chosen as suspicious. Hassan Shakur warns Black Lightning about this when Hassan shows the hero that the bullet that killed Mayor Black is magnetized.
Anissa tells Jenn that she and Grace are married. Jenn suggests that the two should have a honeymoon vacation; Anissa agrees.
While Destiny is having a meeting with her minions, Lala attacks, but he is soundly defeated by Ishmael, who seeks to join the League of Assassins. Destiny encases Lala in concrete to override his immortality.
Val tells Tobias that there is a new Pierce, intriguing him.
Lynn and Jefferson argue because Jefferson wants Lynn to learn what power Val has by injecting herself with the meta-booster, ignoring that Lynn is trying to curb her addiction, especially after Lynn has seen that Jenn's addiction almost costed her her life.
Black Lightning intercepts a police raid on the home of a young couple. Simultaneously, TC talks Jenn into helping her father, despite Lynn's no-power ban, by showing how Lightning is a social media influence. Gambi gives Lightning a temporary suit. The police officers would have killed the young lady of the house needlessly if not for Black Lightning and Lightning. The two finally interact with one another and together are able to stand against the DEGs that the police wield.
Destiny shows Ishmael pictures of four Meta-humans for him to kill, Black Lightning's team.
- Cress Williams as Jefferson Pierce/Black Lightning
- Nafessa Williams as Anissa Pierce
- Christine Adams as Dr. Lynn Stewart
- Marvin "Krondon" Jones III as Tobias Whale
- Jordan Calloway (credit only)
- Chantal Thuy as Grace Choi
- James Remar as Peter Gambi
- Laura Kariuki as Jennifer "JJ" Pierce/Lightning
- Helen Joo Lee as Val Seong
- Wallace Smith as Detective Hassan Shakur
- Rico Ball as Ishmael
- Will Catlett as Latavious "Lala" Johnson
- Christopher A'mmanuel as Baron/TC
- Teesha Renee as Destiny
- Paden Fallis as Marshall Bates
- Kristen Torrianni as News Anchor
- Aaron Goodwin as Local Artist
- Jachin Myers as Boyfriend
- Denisha Gillespie as Girlfriend
- Jessica Nicole Brown as Shy Teenager
- Brialise as Young Woman
- Kailey Harris as Young Girl
- Kennedi Lindsey as Twenty-Something
- Phillip Dang as Kobra Member
- Nadia Lorencz as Lieutenant
- Cal Johnson as Officer #1
- Sean Lyle as Officer #2
- The in-episode title sequence subtitles this episode as "Theseus's Ship", but the official title to the episode doesn't contain the subtitle.
- The alternate timeline shown for Freeland where its citizens protest the death of the young black woman is based on the real life incidents sparked by the death of Breonna Taylor.
- This is the first episode to not credit China Anne McClain as a series regular.
- When Jennifer & Anissa are planning on watching a movie, Anissa's suggestions are 'Big', 'Being John Malkovich', 'Freaky Friday', & '13 Going on 30'.
- Anissa mentions the film 'Face/Off', starring Nicholas Cage.
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