Teaser videos bearing the simple message “#thefourth” that have had "the internet puzzled", are for a limited edition boxset commemorating the Fourth Doctor, doctorwho.tv can exclusively reveal.

The Fourth Doctor Time Capsule - available to pre-order now - is an individually numbered deluxe box-set, containing exclusive content and memorabilia from Tom Baker’s era on Doctor Who, including a newly-commissioned interview with the man himself - An Interview with the Time Lord.

Alongside the interview package, the set contains an advance vanilla release of the restored Terror of the Zygons, set to be released in full later this year. Telling the tale of shape-shifting aliens attempting to colonize the Earth, Terror of the Zygons introduces the titular monsters, who are set to return in the 50th anniversary special.

With a limited run of 5000 units, the Time Capsule also includes:

An exclusive post-regenerative Fourth Doctor action figure, wearing Jon Pertwee’s trademark frill-fronted shirt.

A Fourth Doctor sonic screwdriver.

An audio version of classic Tom Baker story Genesis of the Daleks.

Novel Tomb of Valdemar by Simon Messingham, set during the Doctor’s search for the Key to Time.

Art cards of all the Fourth Doctor’s companions.

And a letter from Tom Baker himself.

The Fourth Doctor Time Capsule will be released on July 29, but you can pre-order it now.