When Ruff tries to fix a leaky faucet, it ends in disaster--flooding the doghouse and ruining the artwork on his walls. Now he's got the blues, but the FETCHers wouldn't understand because they're humans, and humans only use 10% of their brains. The kids disagree with this urban myth, so Ruff sends Bridget and Mike to a neurologist to prove (or disprove) it. He then sends Madi and Willie to meet some blues musicians to play the blues... or are they actually Blue Man Group?