Tere’s this cartoon I saw once, years ago, but I remember it pretty well. I saw this cartoon in early 2000s no later than 2007
It was about these two kids, a scientist and this really big strong guy. They woke up some sacred skeleton-being and it steals their brain power, or “cheese”.
This skeleton creature can only find them if they breathe because it smells their breath to locate them. If the skeleton takes their brain power, the scientist can have someone temporarily provide some else’s brain power to keep them from turning into the skeleton's minion. This works fine until the scientist gets his brain power taken and the other characters freeze him with some magic words until they figure out how to destroy the skeleton. They find how to do this by putting something in the skeleton's left sock and when thrown in some ancient river or lake it resets everyone’s brain power to normal.