The 10 best 'Doctor Who' episodes, according to fans

Catherine Tate and David Tennant in "Doctor Who."BBC America

• "Doctor Who" is celebrating its 60th anniversary with three special episodes.
• The revival of the hit British sci-fi series has been airing since 2005.

David Tennant and Catherine Tate return to "Doctor Who" on Saturday for the first of three special episodes to celebrate the show's 60th anniversary.

The hit series follows the adventures of an alien Time Lord, The Doctor, on his adventures through time and space, and his battles with villains including Daleks, Cybermen, and The Master.

"Doctor Who" first began airing in 1963 and has been running for 60 years on the BBC, though it took a hiatus in 1989.

In 2005, the series was relaunched with Christopher Eccleston as the Ninth Doctor.

When Eccleston's Doctor regenerated — a physical transformation that essentially allows for the lead role to be recast — at the end of season one, he morphed into David Tennant, who was the Tenth Doctor and will return to the role to mark the 60th anniversary.

Here are the 10 best episodes of "Doctor Who" since 2005, according to fan ratings on IMDb.