Henry Deacon is a true jack-of-all-trades. Masquerading as the local mechanic, his feats of engineering are a constant source of wonder and amusement. Whether outfitting Eureka's police cruisers with the latest and greatest gadgets or inventing a global air-conditioning system, Henry has the keen ability to figure out the mechanics of nearly any contraption. Good ol' Henry isn't what he seems, however. Cursed with a four-year memory of an alternate future, he still blames Sheriff Carter for the death of his lost love, Kim Anderson.