All of the UK's soaps are coming together for the first time in history for a major crossover event.
The episodes will be highlighting the issue of climate change, and will be airing from November 1, the same week in which world leaders will meet to discuss the climate crisis at the COP26 conference.
Casualty, Coronation Street, Doctors, EastEnders, Emmerdale, Holby City and Hollyoaks have all filmed special scenes to cover different aspects of climate change.
A number of the soaps will also be directly referencing each other for the first time in history.
Fans can expect their favourite characters to pop up in a different soap, with a Hollyoaks character heading to Walford.
The Hollyoaks village will also learn about what's going on in Holby City, while a Doctors star will feature on Coronation Street.
Two Emmerdale residents will feature in a social media clip viewed by Coronation Street characters, while another Corrie clip will be talked about in The Queen Vic.
The idea was originally conceived by Emmerdale's executive producer Jane Hudson, who's been getting her fellow executives on board.
She said: "Never before have all five soaps and both continuing dramas come together and united in telling one story.
"And we certainly haven't seen characters pop up in other shows before. This is a real treat for our audience, whilst also allowing us to get across a very important message."
Kate Oates, head of continuing drama at the BBC, added: "I'm thrilled that our soaps and serial dramas have all come together to help highlight the issue of climate change amongst our millions of viewers.
"We're grateful to the teams that made this happen, and hugely look forward to seeing the talent from our own shows popping up in other iconic programmes."
Hollyoaks executive producer Lucy Allan added: "We know how important climate change and environmental issues are to our youthful audience, and to all soap viewers.
"It has been great to work together on an engaging way to, hopefully, inspire conversations about issues that are so important."
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