Episode 2 of All Too Clear follows the growing movement of people trying to figure out how to control quagga mussels in the Great Lakes, with varying degrees of success. The “father” of this movement is University of Wisconsin Milwaukee professor, Harvey Bootsma. His most ambitious project is an imposing metal device known as the “mussel masher,” which is towed behind a boat, scouring the lake bottom, to spectacular effect underwater. Husband-and-wife team, Steve and Marie-Claude, are attempting to genetically engineer a “Judas” mussel, with the power to transmit a kind of cancer throughout an entire population of mussels.