The new series of Doctor Who will finally reach its conclusion on Saturday, with fans eagerly hoping that this year's biggest mystery will finally be solved.
For weeks fans have speculated about the identity of The Doctor's companion Ruby Sunday's birth mother, and its hoped that the series' eighth and final episode will provide answers.
Saturday's penultimate episode left fans aghast as it was revealed that the repeated appearances of Susan Triad (played by Susan Twist), were a terrifying plan bythe God of Death Sutekh, who famously appeared during the show's classic era.
The shocking twist left The Doctor and Ruby in the fight of their lives, as they battle to save Earth from being turned to dust.
Ncuti Gatwa's first full series as The Doctor - and Russell T Davies' first since returning has showrunner - has already earned praise from die-hard fans.
It's also been packed with memorable moments, including The Doctor's viral same-sex smooch with dishy bounty hunter Rogue (played by Jonathan Groff), and a 1960s-inspired musical number.
So, as the final episode of Doctor Who's new series hits screens, MailOnline takes a look-back at the most dramatic moments so far...
The new series of Doctor Who will finally reach its conclusion on Saturday, after the penultimate episode's explosive cliffhanger left Earth in mortal peril
Space Babies - The Doctor and Ruby Sunday's first adventure takes a child-like turn
After entering the TARDIS for the first time, Ruby and The Doctor travelled to an unlikely baby farm, where the babies were haunted by anasty creature called The Bogeyman
The episode worked to set the stage for new fans tuning into the show for the first time, after being given a big-budget makeover thanks to a new deal with Disney+
After entering the TARDIS for the first time, Ruby (Millie Gibson) and The Doctor travelled to a spaceship thousands of years into the future, and were shocked to discover a baby farm, run by the babies themselves.
The episode worked to set the stage for new fans tuning into the show for the first time, after being given a big-budget makeover thanks to a new deal with Disney+.
While The Doctor and Ruby encountered these bizarre talking infants, it was also revealed that they were being haunted by a nasty creature called The Bogeyman.
However, it was soon revealed that the creature was actually a creation of the babies themselves, and the Time Lord vowed to save the doomed creature.
Elsewhere in the episode, The Doctor - and viewers - were given their first warning of the dangers around searching for the truth about Ruby's past, after snow followed the pair at every turn.
It was a hint that helped set the stage for this weekend's finale, and also cemented Ruby's relationship with The Doctor as he convinced her to join him for more intergalactic travels.
The Devil's Chord - A surprise musical number leaves fans floored
As part of the two-episode series premiere, Doctor Who's second episode saw the TARDIS duo travel back to 1963, with snazzy outfits to match
As part of the two-episode series premiere, Doctor Who's second episode saw the TARDIS duo travel back to 1963, with snazzy outfits to match.
Landing the TARDIS on the iconic Abbey Road, the pair hoped to witness The Beatles recording their first album, but instead found a world where music was a thing of the past, thanks to the work ofterrifying villain Maestro (played by Drag Race star Jinx Monsoon).
Warned that the world would reach a premature end if Maestro wasn't stopped, the due needed a touch of musical prowess to stop them, and a bit of help from the famous four themselves.
Having thwarted Maestro's plans, the episode ended on a jaw-dropping note, with a musical number aptly warning that there is always a twist at the end.
Boom - Steven Moffat's return leads to a companion's early debut
Steven Moffat's return to the Whoniverse with Boom saw The Doctor trapped on a landmine on a war-stricken planet
Viewers were given a surprise glimpse at one of the show's future companions, with Varada Sethu appearing a year ahead of her planned debut in 2025
Weeks before Doctor Who's new series hit screens, it was revealed that former showrunner Steven Moffat would be returning to pen a new episode.
He had previously fronted the series from 2010 until 2017, and was the mind behind some of the show's most iconic episodes.
Hinting that his latest episode would put tension at the forefront, the episode saw The Doctor frozen with fear after stepping on a landmine in the middle of an intergalactic war.
While he and Ruby came up with a plan to dismantle the weapon, viewers were given a surprise glimpse at one of the show's future companions, withVarada Sethu making her first appearance as Anglican soldierMundy Flynn.
It had already been reported that the Star Wars actress would be joining the show as The Doctor's new companion in 2025, so this early debut came as a surprise to many fans.
Russell has been tight-lipped about the reason behind this one-episode cameo, but did confirm Varada would be boarding the TARDIS full-time as a different character, alongside Millie and Ncuti next year.
73 Yards - Ruby Sunday's curse leads to a huge twist ending
In an episode that was compared by many fans to Russell's series four instalment, Turn Left, Millie Gibson was placed front and centre as The Doctor barely made an appearance
After accidentally stepping on a fairy circle in Wales, Riby finds herself followed by a mysterious woman, who ostracises her from her loved ones
In an episode that was compared by many fans to Russell's series four instalment, Turn Left, Millie Gibson was placed front and centre as The Doctor barely made an appearance.
After accidentally stepping on a fairy circle in Wales, Ruby found that The Doctor had mysteriously vanished, and soon noticed that she was being followed by a strange woman, who always kept a fixed 73 yards distance from her.
To make matters worse, Ruby learned that anyone who spoke to the woman would run away from her in horror, leading to her being alienated from her loves ones and even UNIT after seeking their help.
Drawing comparisons to Russell's acclaimed BBC drama Years and Years, Ruby decided to use her newfound life to stop a rising politican, who The Doctor had previously warned would come close to plunging the UK into a nuclear war.
The episode then concluded with a jaw-dropping reveal in its final moments, that the woman in question was Ruby herself, sent to her as a warning to stop The Doctor from stepping on the fairy circle, and thuse setting the episode's events in motion.
Actress Millie earned praise from fans for leading the episode, with many also noting that it left several questions unanswered, sparking more theories as the countdown to the finale began...
Dot and Bubble - The Doctor's rage is revealed in shocking final act
Taking the show in a Black Mirror-inspired direction, Dot and Bubble saw The Doctor and Ruby attempt to save the bratty Lindy Pepper-Bean from mysterious slug creatures
However the episode's final moments take a dark turn, with The Doctor's help is refused by the Finetime citizens he'd saved, as they he'wasn't one of them'
It was the first time that this Doctor encountered such stark racism, and Ncuti's performance in emulating the Time Lord's rage earned praise from viewers
Taking the show in a Black Mirror-inspired direction, Dot and Bubble saw The Doctor and Ruby attempt to save the bratty Lindy Pepper-Bean from mysterious slug creatures that had invaded the idyllic town of Finetime.
Set in the distant future, residents of Finetime are bound by a literal social media bubble, unable to take a single step forward without guidance from the virtual presence that surrounds them.
While the episode opens with the warning that these human-eating slugs are the real threat, it soons reveals that the humans that The Doctor and Ruby attempt to save are far more sinister.
The Doctor and Ruby guide Lindy to safety - unaware that shehappily allows her idol Ricky September to be killed by the now-evil AI that the social media system came from, in a bid to save her own skin.
The Time Lord is then floored when she and other residents of Finetime refuse his help, insisting he 'wasn't one of them.'
It was the first time that this Doctor - played by a black actor for the first time in the show's history - encountered such stark racism, and Ncuti's performance in emulating the Time Lord's rage earned praise from viewers.
Rather than conclude the episode on a happy note, it ended with The Doctor angrily returning to the TARDIS, having accepted that Lindy and other residents on Finetime would rather die than accept his help.
Rogue - The Doctor shares his first same-sex kiss
Anticipation for the sixth episode of Who's new series was high after Jonathan Groff joined the cast as the mysterious bounty hunter Rogue
Sparks soon fly beween Rogue and The Doctor, and the pair share a historic kiss, with fans hoping that the episodes' final moments hint the handsome hero may return in the future
Even before Who's Bridgerton-inspired romp hit screens, anticipation was high as it had been previously announced thatBroadway star Jonathan Groff would be joining the cast.
The episode sees The Doctor and Ruby travel back to 1813 to attend a Regency Ball, and the Time Lord's head is quickly turned by an intergalactic bounty hunter named Rogue, who is hunting the alien race The Chuldur.
Sparks soon fly between the pair, and after confirming to Rogue that he was not the alien assassin that he was looking for, the Time Lord bonds with the space anti-hero over their shared losses.
It leads to a charged moment in the TARDIS, where The Doctor invites Rogue to travel with him, before they join forces to stop the bird-like Chulder.
The episode was packed with odes to the racy Netflix drama, including a dramatic dance scene where Rogue proposes to The Doctor to catch the Chulder's attention, after discovering their penchant for cosplaying.
But The Doctor's new romance is short-lived, as he is forced to choose between sending the Chulder to a barren dimension, and saving Ruby after she becomes trapped in the transport gate.
Admitting he can't let his friend go, The Doctor and Rogue share a passionate kiss, the first time the Time Lord has shared a same-sex smooch in the show's history.
Rogue then sacrifices himself to save Ruby, with his final words to The Doctor being 'find me,' and fans have already called for Rogue's return in the future.
The final scenes certainly hinted at the possibility that The Doctor and Rogue could reunite in a later series, as the episode concluded with the Time Lord wearing the ring that Rogue proposed with, hopefully cementing a reunion in a series to come.
The Legend Of Ruby Sunday - The One Who Waits is FINALLY revealed
In Doctor Who's penultimate episode, fans were floored when it was revealed that the God Of Death Sutekh had returned
In a shocking cliffhanger, it was revealed that the mysterious woman who stalked The Doctor's travels was little more than a pawn in the God's game
The episode also finally began to offer answers about the identity of Ruby's birth mother, with the hope that this mystery will finally be solved in this weekend's finale
In the series' penultimate episode, Doctor Who fans hoped that they would finally discover the truth about the mysterious woman who had appeared in multiple incarnations throughout the TARDIS' adventures.
Played by actress Susan Twist, the woman appeared as a variety of characters, from a 60s tea maid and an AI-generated ambulance, to finally, the modern tech mogul Susan Triad.
In the episode, The Doctor and Ruby sought help from UNIT to find out the truth about the woman, and answers about the companion's birth mother, who abandoned her daughter at a snow-covered church on Christmas Eve.
The return of UNIT also saw Bonnie Langford reprise her role as companion Mel, along with Jemma Redgrave as Kate Lethbridge-Stewart.
The opening scenes were quick to address the theory that Susan could be the Doctor's long-absent granddaughter, hinting that it could be a giant red herring.
The Doctor tried to identify Ruby's mother by reconstructing CCTV footage using a time window, but they were unsuccessful.
A dark red cloud then appeared to engulf the TARDIS itself, before breaking into the real world, revealing that Susan Triad was just a pawn in the plans of a far more terrifying villain.
In some of the show's scariest scenes yet, it was revealed that the long-imprisoned God Of Death Sutekh had been waiting in the TARDIS, and finally unveiled himself and his plot to turn the universe to dust.
It remains to be seen whether The Doctor can bring an end to this threat, and finally reveal the truth about her birth mother.
Doctor Who's series finale will be released at midnight on Saturday on BBC iPlayer in the UK, and will air at 6:40pm on BBC One that evening. The series is available to stream internationally on Disney+.
