Ultraman S01E09 - Baron Spider

Jun, lppei, Yuriko and friends get lost in a thick fog driving back from a party. In need of shelter, they find an abandoned mansion in the middle of the swamplands. This reminds Jun of a story of a Baron who was obsessed with spiders and went mad when his daughter went missing in the swamp after a poisonous tarantula bit her. According to legend, she and her father turned into Giant Spiders.