A nine-year-old boy's winning design for a monster is to feature in the next Doctor Who series on BBC1.
David Tennant (left) and Blue Peter's Gethin Jones with William's monster
William Grantham, from Colchester, Essex, has come up with an Abzorbaloff, a monster which absorbs his victims in his gargantuan body.
The judging panel for the Blue Peter competition included the new Dr Who, David Tennant, and the series' executive producer Russell T Davies.
Davies agreed to use the monster in the next series of the BBC1 sci-fi hit.
He was an entrant in a Blue Peter Design a Monster competition in the 1960s.
This year's competition broke records with 43,920 entries - the biggest response to a Blue Peter competition since 1993.
Blue Peter editor Richard Marson said: "We were staggered by the popularity of the competition.
"We knew Doctor Who had been a huge hit with our audience but this was something else.
"Every day brought more sacks and, as well as getting all hands on deck in the Blue Peter office, we also had to draft in extra help to get through the mountain of highly inventive designs."