Secret is a ghostly member of Young Justice who joins the team after Robin, Impulse, and Superboy free her from the Department of Extranormal Operations.

She is later revealed to have been a human named Greta Hayes who was killed by her adoptive brother Billy.

[1] Harm later kills Secret on Apokolips before Darkseid fully resurrects her.

[2] Subsequently, Greta enrolls at the Elias School with Cassandra Sandsmark and Cissie King-Jones.

[3] As a ghost, Secret can fly, teleport, shapeshift, become ethereal, possess any sentient beings, and take souls to the "other side".