He is a slime monster who causes chaos by spitting out green blobs of slime. He has no nose and no teeth still just a mouth. In Going Long, Going Wrong 4 goes on the mission.
Episodes to the Problem Blob
2. Going Long, Going Wrong [Four] The Problem Blob is making things longer and longer. 4 is on the mission to stop him.
6. Forward Thinking [Six] The Problem Blob is making things walking backwards. 6 is send out there to stop him.
23. Say What You Mean [Four] Be careful what you choose or the Problem Blob will end up with something silly as 4 will find out.
27. Best Estimate [Five] The Problem Blob is behaving strange. 5 goes out there.
32. Fair Shares [Six] The Problem Blob is stopping things being shared out fair. 6 flies out.
36. Six Of One [Six] The Problem Blob is making things with sixes. 6 to the rescue.
40. Almost Human [Four] The Problem Blob is causing chaos. 4 tries to be a human.
42. Round and Round [Five] The Problem Blob is making things stuck in a pattern. 5 has to break the pattern.
47. Seaside Adventure [Seven, Eight, Nine, Four, Five, Six] 7, 8, 9, 4, 5, and 6 are away on holiday. They came to join in with the Numbertaker, the Puzzler, the Problem Blob, the Shape Japer, and the Spooky Spoon.
50. On The Move [Five] The Problem Blob is making things moving around. 5 is on the case.
56. Carry On Counting [Six] People should carry on counting. Not going back to the beginning. 6 is on the case to look out.
59. A Close Thing [Six] The Problem Blob is making things closer and closer. 6 flew out.
64. The Dreaded Lurgi [Five] The Problem Blob is making things children jumping with ups and downs. 5 fires Brain Gain.
69. Shorter Things [Four] The Problem Blob is making things shorter and shorter. 4 stops him making things across the edge.
77. Grandad Dog's Garage [Four]
81. So High [Five] The Problem Blob is making things high and low. 5 is send out there to stop him.
98. The Incredible Shrinking Duck [Three, Four, Five, Six] Peep and Chirp have been slimed by the Problem Blob. Three and Four flew out. And it was Spooky Spoon. Quack the Duck is stuck in Peep's can. So Five and Six flew out. And it was the Puzzler. And Two, Seven, Eight, and Nine are back at base. And it was the Numbertaker. Seven, Eight, Two, and Nine lost contact. And it was the Shape Japer.