The gravelly-voiced Beta, also known as B, began existence as one of the Quintessons' many robotic slaves. She would not remain so. In the course of time she became a warrior, armed with a powerful crossbow weapon, and standing beside her partner A3 she would be a leader in the robot rebellion that freed Cybertron from its Quintesson masters.
The Transformers cartoon
The night before the climactic battle with the Quintessons, Beta found that A3 and his Coda Remote had gone missing. With the remote's ability to override the Dark Guardians necessary for a slave victory, Beta went searching for her missing counterpart. Though he was nowhere to be found she did stumble across a group of strange and powerful robots that improbably also wore the slave brand.
After rescuing them from a Dark Guardian, Beta secured their help in the revolt. The strange robots did their part until A3 returned, much to Beta's bear-hugging joy, and saved the day. Beta's fate after this is unknown.
- Since Beta is from the time before the invention of transformation, she is technically not a Transformer.
- A veiled reference is made to Beta in the bio for the Beast Machines Deployer Rav.
- The Energon Omnicon Arcee's toy appears to take several design cues from Beta, notably the helmet crest and crossbow weapon.