Big Bertha is a giant plant monster created by Telulu. She appeared in Sailor Moon S Episode 32, Fiendish Ferns.

When Telulu injected her last remaining Venus Heart Trap, it transformed into a giant plant monster, Big Bertha. According to Telulu, she has a bottomless appetite and feeds on Pure Hearts. Once she eats a Pure Heart, it will be gone forever, making her useless as an energy source, but this did not matter to Telulu as she already had a large amount of Pure Hearts in her star crystal. However, Tuxedo Mask shattered the crystal to release the Pure Hearts. Big Bertha suddenly turned on Telulu and grabbed her. Telulu used her vines to electrocute Big Bertha, who then selfdestructed, killing Telulu as well.

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