Peter Harness' The Zygon Invasion brings back familiar foes in a world-traversing, fast-moving part one.

Here’s our spoiler-free review…

Crikey, spoilers.

Here, hes put together for want of a better way of putting it a veryDoctor Who-y opener.

For theres no shortage of ambition here, in aDoctor Whostory that traverses the globe.

Im still thrilled the Zygons have been revived.

Were avoiding spoilers, so well leave that there.

Here, Harness story is fast, and gets through an awful lot of work.

Its a bit of a blockbuster movie, and it remains a joy to see the Zygons at work.

Lots of fun, this, and its teeing up a potential frantic and impactful part two.

With yet more Zygons in it…!

The Zygon Invasion airs on Saturday the 31st of October at 8:15pm on BBC One.