Eureka: Season 1, Episode 3

1 - 3: Before I Forget

When a world renowned scientist arrives in Eureka, Jack and Henry suddenly find that they cannot account for blocks of time. The scientist uses a device Henry created that emits an EM pulse that messes with people's electrolytes in the brain and causes them not to form short term memories. The scientist then would wait for someone to make a breakthrough, erase their memories, and copy it as his own.