Blockzilla is a Numberblocks episode. This episode aired on the CBeebies channel on September 18, 2018.
The monster tale of a colossal creature who really, really likes bigger numbers, and wants to play with the Numberblocks.
One is hopping around with a basket in her hand, and as soon as she goes off-screen, a monster, Blockzilla, with a mouth that looks like a greater than/less than sign pops out of the ground. She looks at the tree, then the flower. She states that the tree is bigger than the flower. She greets the tree, but it doesn't respond, much to her dismay.
Meanwhile, Two and Three are sitting on a picnic blanket. Two pulls two apples out of his basket. One apple is bigger than the other, so Two decides to give it to Three, as she's bigger than him. While she eats, Blockzilla pops up out of the ground and looks at Two and Three.
3 > 2
Three grabs Two by the hand and runs off screaming "Don't gobble me up!". They are too far to hear when Blockzilla says she doesn't want to eat Three, and disappears again.
Four and One are having their own picnic elsewhere. Four is having square cheese, when he is interrupted by Three and Two, warning them about Blockzilla. Three says Blockzilla wants to "munch them, crunch them and gobble them up". They run off to hide.
One and Three go inside a cave, which is actually Blockzilla's mouth.
1 > 3
One and Three run away, much to Blockzilla's dismay, as Blockzilla flips over to look the opposite direction. Four and Two also think that it's a cave, so they hide.
4 < 2
Four asks if Blockzilla likes him in the same way he likes square cheese, in his tummy. Four and Two scream and run away, along with One and Three.
They all shout at once to Five, warning her about Blockzilla. Five says that they need to make a plan, and they agree.
Later, when Blockzilla re-appears, they put this plan into action, trading blocks in order to fluster her, until finally forming Four on both sides, causing her mouth to become an equal (=) sign:
4 = 4
As the Numberblocks begin talking about their victory, Blockzilla corrects them a final time, saying that she wants to play with them, rather than eat them as they'd feared.
The episode ends with the Numberblocks and Blockzilla playing happily together.