Mind Candy is celebrating the fifth anniversary of its Moshi Monsters brand with a party in London this week.

The brand, which started as an online world of adoptable pet monsters for kids ages 6 to 12 in 2008, has since become a global phenomenon, reaching in to more than 150 territories worldwide.

In 2011, Moshi Monsters expanded into consumer products with extensions in publishing, gaming and toys, with great success–Moshi Monsters Magazine is the No. 1 monthly kids’ magazine in the U.K. and the video game “Moshi Monsters: Moshlings Zoo” made history when it held the No. 1 spot on the Nintendo DS chart for 23 consecutive weeks.

Mind Candy continues to move forward with the brand with plans for a feature film this year, as well as new experiences for touchscreen devices.

“Many people assume Moshi is a Japanese or American success story, but we’re very proud to say it’s a homegrown British phenomenon,” says Michael Acton Smith, chief executive officer, Mind Candy and creator of Moshi Monsters. “The last five years have been an extraordinary journey. We’d like to say a huge thank you to the millions of children and parents that have adopted a monster and played within the weird and wonderful Moshi world.”