Adjust your sonic screwdriver for plot reveals, because this article contains spoilers for "Doctor Who" season 2, episode 2, "Lux".

"Doctor Who" season 2, episode 2, titled "Lux," is a statement of intent. Apart from providing all the usual thrills and spills of a great episode of the venerable sci-fi series, it also ticks the boxes on other modern "Doctor Who" staples, such as tackling social issues and proving that the series continues to have its finger on the fandom's pulse. 

Here, the Doctor and Belinda Chandra (Varada Sethu) find themselves in 1950s Miami, where the mysterious appearance of a moonlight-animated cartoon character called Mister Ring-a-Ding (voiced by Alan Cumming) provides the episode's central mystery. Still, while they tackle a succession of serious issues, from the grim reality of the era's segregation to the extremely "Doctor Who" twist that Mister Ring-a-Ding is one of the ultra-powerful chaos gods that have been plaguing this incarnation...