#any other plotline

1) Grandpappy Cooper kills Grandpappy Blossom, who is actually his brother. However, in season 6 they retcon it so Grandpappy Blossom actually killed Grandpappy Cooper.

2) Grandpappy Cooper changes his last name from Blossom to Cooper, moves to a different house in Riverdale, and no one ever questions him about his life and apparently the Blossoms don't remember the murder. As of season 6, I guess he already had a family and the family just sort of vibed and didn't press charges, instead changing their name for like...some reason.

3) The Conway family finds out about the murder...somehow I guess, and starts blackmailing Hal's Dad about it. Now this doesn't make sense even a little bit, but it somehow makes less sense after season 6 because they're being blackmailed about being the victims of a murder, which is a UNIQUE experience.

4) Hal's grandfather decides the only logical solution is to murder the entire Conway family to hide how his father was a murderer/victim. BUT he leaves alive one of their kids...just cause

5) A home video is recorded where Hal promises to purge the town of sin and also unrelated convince a 7 year-old Joseph Conway to commit perjury on the witness stand so Hal's father isn't convicted of murder. This works. Hal loves his daddy very much.

6) 35 whole human years pass

7) Betty gives a random speech at a Riverdale celebration

8) Hal gets a war flashback to this home video and decides that it is now his mission to kill every sinner in Riverdale, including adulterers despite he himself being an adulterer.

9) Hal becomes the Black Hood

T L D R ;

A family is blackmailed over their grandpappy being the victim of murder so hard that they resort to murdering an entire family save one 7-year-old who is then convinced to commit perjury by his friend, and then 35 years later becomes the pawn of a serial killer who is also that friend motivated by his daughter's really freakin good town hall speech.