WhoSpy

 was a feature on the Doctor Who website which launched on 20 July 2004. A "spy" on the Doctor Who production team uploaded a new behind-the-scenes photo every weekday throughout the filming of Series 1.

A recurring sequence of numbers, 23 6 801, seen in many of the WhoSpy photographs, was a bit of "misleading fun" that sparked many fan theories.

Series 1
WhoSpy initially ran for 36 weeks, finishing on 23 March 2005 and had a total of 176 photos. Following the launch of the "new series" website, it was moved to its "The Making of Doctor Who" section; from the BBC Cult site. During the broadcast of Series 1 the pictures were updated with captions explaining what the photos were of and which episodes they came from.

Series 2
WhoSpy returned for the second series on 5 August 2005, but it stopped abruptly after only 15 weeks and 74 photos on 17 November 2005. The next day the website was redesigned and WhoSpy was completely missing.

The Runaway Bride (Adventure Calendar)
After over a year away, WhoSpy returned again as the treat for Day 13 of the 2006 Advent Calendar. An unknown number of images teased the upcoming Christmas special - TV: The Runaway Bride.

Voyage of the Damned (Adventure Calendar)
Day 3 of the 2007 Adventure Calendar featured 6 images teasing TV: Voyage of the Damned.

The Next Doctor (Adventure Calendar)
Day 14 of the 2008 Adventure Calendar featured 5 images teasing TV: The Next Doctor. After broadcast these images were incorporated into the episodes' Photo Story feature.

The End of Time, Part One (Adventure Calendar)
Day 22 of the 2009 Adventure Calendar featured 15 images teasing TV: The End of Time, Part One. Again after broadcast these images were incorporated into the episodes' Photo Story feature.

" It's the long awaited return of WhoSpy! For those new to this parish, every year we provide tantalisingly obscure sneak peeks behind the scenes of the next adventure. So these images don't contain spoilers... simply food for thought and wild speculation. In fact, the wilder the better. This is Christmas, after all! The End of Time, Part One debuts on BBC One on Friday at 6.00pm. Merry Christmas!"