Kidnappers who stole a Dalek have sent its owners a ransom note and the robot's amputated plunger.
The TV villain was taken from Wookey Hole Caves in Sommerset on Monday, and its owners offered a £500 reward for the return of the Doctor Who model.
Staff at the tourist attraction found the plunger arm and a ransom note on a doorstep on Thursday.
The note said: "We are holding the Dalek captive. We demand further instructions from the Doctor."
The group, which called itself the Guardians of the Planet Earth, explained it had removed the Dalek's plunger "for the safety of the human race".
Dalek plunger and note
Wookey Hole manager Daniel Medley said: "The arm has been removed quite carefully, it hasn't been ripped off, there's no torture involved.
"So if we get the rest of the Dalek back, we should be able to put it back together like a jigsaw," he added.
It's thought the Dalek may have been taken by students, and some think it could be heading as far as Edinburgh for the G8 protests.
The 1.5m model is believed to have starred as one of the original Daleks in the BBC series.