The Spook Sisters are a pair of two eight-year-old identical twin sisters named Shelly and Sandra, and they always dress in Halloween costumes. Shelly always dresses like a vampire, while Sandra always dresses like a goth. The twins share their haunted house with eight female bats that can speak fluent English. Despite the girls' spooky looks, they're actually very friendly. They sleep in coffins instead of beds to add their spooky spirit.