Age Level: 7 - 12
Lexile Measure: 600L
Timeless cheese sticks! Professor Maximilian Mousemover just arrived in Muskrat City ... in a time machine! Tony Sludge's great-great-grandfather Butch Sludge is visiting from the past, too, and he's up to no good. The Heromice must travel through time to save the rodents of the past - and the future - from the Sewer Rats.