Space Beth’s lore is defined by a central mystery of identity and her transformation into an intergalactic revolutionary. Her story arc explores the "nature vs. nurture" conflict through the lens of a daughter trying to outshine her father. [1]
Origin and the "Clone" Mystery
Her existence began in the Season 3 episode "The ABC's of Beth," when Rick offered Beth a choice: stay with her family or travel the galaxy as a space adventurer while a clone took her place. [1, 2]
The Choice: Beth refused to choose and told Rick to decide for her.
Rick's Irresponsibility: Rick cloned her, put both Beths in vats, and had a machine shuffle them so even he wouldn't know who was who.
Memory Erasure: To finalize the mystery, Rick erased his own memory of the event, creating a "Schrödinger’s Beth" scenario where both are equally "real" and potentially "clones". [1, 2, 3, 4, 5]