Nightscreech was born as a pet cat called Stormcloud, although his sister Snowflake called him Darkstalker, since he usually hunted dinner under the cover of darkness.
One of Stormcloud's owners was a chemist, and when an experiment went wrong and the chemist's chemical solution spilled all over Stormcloud, giving him extra-good night vision, the ability to turn invisible, and other powers. Stormcloud's only option was to become a superhero. Originally under the alias Darkstalker, he gained the name Nightscreech because it was a fitting nickname the Cat Titans, a group of cat Teen Titans he had formed, and he called himself Nightscreech ever since.
Nightscreech is a black tabby tom with a black nose and yellow-amber eyes.