It's Alphablocks v Numberblocks in the first ever Blocks v Blocks obstacle relay race.

Detective One is on the trail of Big Tum as he chomps his way through Alphaland. Yum, yum!

Tentacled troublemaker Octonaughty is back! Can Octoblock and The Exciting X save the day?

Two worlds collide as the Alphablocks meet the Numberblocks for the very first time.