Black widow is a strong toxic spider, belonging to the arachnid, arachnids, spherical arachnids. The body size is small, the body length is usually between 8-13mm, the female is larger, the male is smaller. The body color is black, with red or orange hourglass-shaped markings on the abdomen, which is its distinctive feature. Widely distributed in the temperate regions of North America, often inhabited in dry, dark places. The net takes the form of an irregular reticulated structure and is usually located near the ground. It feeds on insects and other small animals and catches prey through its powerful cobwebs. The venom contains neurotoxins, which are dangerous to humans and animals.

Natasha Romanoff, also known as Black Widow, is a superhero under Marvel Comics in the United States, first appearing in Issue 52 of "Suspense Stories". Full name Natalia Arianovna Romanova, also known as Natalia Romanova, was born in Stalingrad, former Soviet Union in 1928. She was trained as a special agent by Soviet agents from a young age, and her body was greatly modified by the Soviet government to slow down her aging rate and enhance her immune system and resistance to attacks. She has become a deadly poisonous spider "Black Widow" and defected to the Soviet spy organization "Red Room", joining the Avengers.