LEGO, dinosaurs and a Frozen sing-along: Britain's Biggest Family Event in Hyde Park just got even bigger.
Name a favourite family character and chances are, they'll be there. Scooby Doo, Daffy Duck, Justin Fletcher, Horrible Histories, Peppa Pig, Shaun the Sheep, SpongeBob Squarepants, the list goes on...
Let it go with a Frozen sing-along on the main Great Oak Stage, travel to Jurassic World in the Gaming Zone, and burn off some excess energy with the Loony Tunes characters on the Carnival Stage.
If you've got teenagers to entertain, there's the chance to meet the stars of YouTube, with BBC Radio 1's Jack & Dean, twin superstars Niki n Sammy and performances from musician Bethan Leadley. Lifestyle vlogger Helen Anderson will be sharing fashion and beauty tips and taking questions from the audience; and Ugly Face of Beauty will all be there to share their lifestyle tips.
There's also an urban area with BMX, parkour and other extreme sports. Plus award-winning street food and plenty of good old-fashioned family entertainment.
For our picks of the rest of London's festivals, see our guide.
Barclaycard presents British Summer Time runs from 18-28 June, and includes shows by Kylie, The Who, Taylor Swift, and Blur. The family day is on 28 June.