Matt Tebbutt issued a demand to Saturday Kitchen viewers as he made an announcement about the programme.
The BBC show is undergoing a schedule shake-up next week and will air 15 minutes earlier than usual, hitting screens at 09:45am instead of 10:00am.
The special episode is celebrating 40 years of BBC soap EastEnders, with four of its core stars joining Matt, 51, to mark the anniversary.
At the end of Saturday's programme, Matt said: "I'll be back here live next Saturday a little earlier than usual at 9:45, so set your alarms because we've got an EastEnders special to celebrate 40 years of the iconic BBC soap."
Appearing on the programme will be Ian Beale star Adam Woodyatt and Denise Fox actress Diane Parish. Jacqueline Jossa, who stars as Lauren Branning, will also be in the studio alongside Honey Mitchell star Emma Barton.
EastEnders will be going live for a full episode as part of its celebrations for its 40th anniversary but this time with a twist.
The audience will have the power to decide the outcome of one storyline between Denise, Jack Branning (Scott Maslen) and Ravi Gulati (Aaron Thiara).
During Saturday Kitchen, Matt "let slip" a detail about the show in a surprising admission.
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