Spidera is a fictional creature and an antagonist featured on the ThunderCats animated television series. She was voiced by actor Earl Hammond and first appeared in "Queen of 8 Legs". Spidera hails from the future reality known as Third Earth and resides in the Kingdom of Webs, where she is queen of the Giant Spiders. She is a giant spider monster with grey legs and face, and white fur across her head. The ancient sorcerer, Mumm-Ra took note of the newly hatched queen and baited the ThunderCats into the Kingdom of Webs where he had hoped Spidera would defeat them. One of Spidera's underlings captured Snarf in a giant web, and Lion-O had to go to the Kingdom of Webs to rescue him. Lion-O fought against Spidera until he too became trapped in one of her webs. The rest of the ThunderCats arrived in the ThunderTank to rescue him.