Cerberus is a creature on ABC's Once Upon a Time, appearing as a three-headed hellhound who takes orders from Hades.
- Hades (owner)
- Cerberus is based on the three-headed canine underworld guardian from Greek Mythology.
- Cerberus appeared to have been under Hades' control, since when he whistles, Cerberus calms down.
- S5, E13: "Labor of Love"