[s2e13] The First Secret -

At the party, Alison stages a terrifying "attack" by a masked assailant to test the loyalty of her friends. She is initially amused until she realizes the person she thought was her partner-in-crime (Noel) wasn't actually there for the prank. Key Character Backstories

Discovers her father, Byron, having an affair with one of his students, Meredith, and is sworn to secrecy. [S2E13] The First Secret

Fans often cite this as a top-tier episode because it fills in essential gaps in the Rosewood lore. It highlights Alison’s manipulative nature and the complex power dynamics she held over her "friends," while also planting early clues about the and the identities of those who hated her most, such as Lucas and Mona. Pretty Little Liars S2.E13 “The First Secret” At the party, Alison stages a terrifying "attack"

Is under immense pressure to win a school election, leading to Alison manipulating the results in her favor. The Origin of "A" Fans often cite this as a top-tier episode