For the first time in the soaps' history, characters will meet one another in the aftermath of a devastating multi-vehicle pile-up on a road between their respective fictional locations.
Luckily, we've got you covered with a guide to everything you need to know.
John Sugden's reign of terror
It soon became apparent that he was a very complex character with a hero complex, who would stage dangerous incidents to make himself look like the better party. He has killed two people, including Cain Dingle's (Jeff Hordley) son Nate.
John fell in love with Aaron Dingle (Danny Miller), who was once married to his imprisoned half-brother Robert (Ryan Hawley).
He subsequently went on the run, but has returned over the Christmas period to seek revenge.
Both Robert and Aaron have been held at gunpoint, with the latter realising that the only way to stop John would be to pretend to go along with his plan to move away together.
Charity Dingle's baby nightmare
Her greatest desire was to have a child with husband Jacob Gallagher (Joe-Warren Plant), but during IVF treatment they realised she had early-stage cervical cancer and she had to have a hysterectomy. Charity stepped in and decided to carry a child for them.
However, at the same time, Charity strayed from husband Mackenzie Boyd (Lawrence Robb) with ex-lover Ross Barton (Michael Parr), and fell pregnant with his child instead.
In tomorrow's crossover, he's determined to reach Sarah and Jacob ahead of their honeymoon to explain what Charity has been up to.
Ray Walters and Celia Daniels's criminal masterplan exposed
The mother and son duo have been running a drugs operation across Yorkshire, recruiting the youngsters as part of it. They later forced April to sell her body, though when she refused, she smashed a vodka bottle over the head of a creepy 'client'.
Ray made her believe that she'd killed the man, and has been blackmailing her and dad Marlon (Mark Charnock) for months. When they threatened to go to the police, Celia instructed Ray to plow into Dylan with his car.
Ray has also been enjoying a relationship with oblivious Laurel Thomas (Charlotte Bellamy), and in a desperate bid to be with her, he killed domineering Celia so that they wouldn't have to flee the village.
However, when Ray went to deliver the good news to Laurel that he wouldn't be leaving after all, Dylan had already told her everything.
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Corriedale airs on ITV1 and ITVX at 8pm on Monday, 5th January.
Check out more of our Soaps coverage or visit our TV Guide and Streaming Guideto find out what's on. For more TV recommendations and reviews, listen to The Radio Times Podcast.
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