The 7th Dimension
The 7th Dimension is the BBC's regular radio slot for science fiction, fantasy and horror. It is broadcast on the digital radio station BBC Radio 4 Extra at 6 p.m. (GMT in winter, BST in summer) on Sundays and repeated at midnight. The original and still frequent host is Nicholas Briggs, but other hosts include Toby Hadoke, Natalie Haynes and Nicola Walker. Most of the programs are full cast dramatizations and the remainder are book readings. "The Seventh Dimension" has hosted both standalone stories and serials. Most of the programs are drawn from the BBC's  extensive archives and have previously been aired on other BBC stations. A few "Seventh Dimension" shows are new commissions, such as "Undone", "The Spaceship" and "Planet B", or new acquisitions like "Night Terrace". It also sometimes uses Big Finish Productions of "Doctor Who". Originally aired on BBC 7, it retained the 7 in the name when BBC 7 became BBC Radio 4 Extra.