Ultraman S01E04 - Mammoth Flower

In Tokyo, a huge thorny plant breaks through the streets of Tokyo's business district and sub basements and feeds off of what it catches. It pushes into the roof of the Mainichi Shimpo News offices, where its poisonous flower blooms. Professor Ichinotani believes this plant, Juran, has revived due to man-made environmental changes and seek to destroy it, but Professor Genda wants to study it.