Venom Grubs were a species used by the Slitheen family to dispose of unwanted members.
Blon Fel-Fotch Passameer-Day Slitheen claimed that if she didn't follow the criminal activities of the rest of the family, she would have been fed to the Venom Grubs by her father. (TV: Boom Town)
Behind the scenes[]
"Venom grub" was also the name given to the larvae guns in Bill Strutton's novelisation of The Web Planet.