The ITV series was forced to halt production due to the pandemic.
On Sunday night, the show was back, with a pre-recorded instalment to show which contestants had made it through to the semi-finals.
The dozens of acts include Aidan McCann, a young magician from Ireland, and Amanda and rescue dog Miracle – a magic act from Scotland.
🚨FIRST LOOK 🚨
After a tough deliberation, the Judges are finally ready to reveal who will be making it through to the #BGT 2020 SEMI-FINALS! 🤩
Don't miss Britain's Got Talent: The Finalists Revealed, this Sunday, 6:30pm on @ITV and @WeAreSTV. pic.twitter.com/hjlfm19Ekb— BGT (@BGT) August 28, 2020
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Others to have made it through include the Chineke! Junior Orchestra and Class Dynamix, a choir from Leeds.
Papi Flex, a contortionist from Belgium, and Wesley Williams, a unicyclist from Florida, also got through to the next stage, with the Golden Buzzer acts.
It was previously announced that Diversity star Ashley Banjo will take Simon Cowell’s place on the judging panel for the semi-finals while the music mogul recovers from back surgery.
Cowell, 60, broke his back in a number of places after falling off a new electric bike he was testing at his house in Malibu.
Banjo will join regular judges Amanda Holden, Alesha Dixon and David Walliams on the panel.
The final will air in October, with the winner taking home £250,000 plus a slot at the Royal Variety Performance.
Some acts will take part via videolink whilst others will perform in the TV studio without a live audience.
Instead, a virtual audience will watch from their homes and their reactions will be broadcast into the studio on a giant screen.