"Why did he say 'argh'?"
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Cierra Dalek is in the VenturianTale Doctor Who 50th Anniversary episode. She has a sister named Bethany Dalek. She is very frightened of Papa Acachalla and says that he is a Dalek Killer.
Cierra Dalek and Bethany Dalek somehow managed to get onto the TARDIS with Spencer and British Billy and volunteered to become companions. Spencer tried to ally himself with the Daleks in an attempt to take over the TARDIS, but as he wasn't British they killed him. They then chased Billy through the TARDIS but were scared off by Papa Acachalla. During the fight Cierra Dalek and Papa Acachalla were both killed by a grenade.