Episode: The Invisible Blob
Episode number: DS04
Original air date: 9th October 1990, CITV 4.10pm
Repeat showing: 15th April 1992, CITV 3.55pm (after this repeat, the second half of new season two episodes began to air)

Synopsis:

The episodes opens at Viltheed, where Blob is commanding his men around an assault course unaware that Urpgor has concocted an invisible formula. Urpgor is experimenting the formula out with the Urpney army by playing tricks on them. He had earlier put the formula on a wall which Blob bangs into unaware that a wall is actually there!

Over in the Land of Dreams, Rufus and Amberley are helping out the Wuts with harvesting the dream bottles, transporting the first crop of them to the Dreammaker. Back at Viltheed, Zodrak tests out Uprgor's new invisible formula out on a random Urpney. Blob, Frizz and Nugg are then instructed to go to the Land of Dreams unseen (using the invisible formula) to steal the Dreamstone. They are sent to the Land of Dreams using Urpgor's latest jetpacks to fly them there.

The three Uprney's arrive at the Dreammakers house, but Albert is suspicious when he hears the invisible Urpney's whispering. Albert tries to tell the Dreammaker that the Urpney's are in the house intent on stealing the stone.

The Urpney's enter the tower and get the stone, pouring the invisible formula over it, to make it invisible. They take the stone and during their escape the invivible formula starts wearing off with half the Urpney's bodies being invisible and the other half being clearly visible!

Albert manages to stop the Urpney's and in the process Blob accidentally drops the Dreamstone leaving it behind on the grass of the Dreammakers lawn. Blob doesn't realise he had dropped it, with it being invisible. The Dreammaker, Rufus and Amberley think the Urpney's have got away with the stone. However Albert can smell the Dreamstone and tries to tell the others, they soon realise that the Urpney's had dropped the stone when it reappears as the effect of the formula wears off. When the Uprney's return back to Viltheed without the Dreamstone, Zordrak is not pleased!