Tommy has rocky encounters with Janet and Sheila, and an encounter with Kelly that isn't as rocky. Meanwhile, the guys go grocery shopping with the newly domesticated Lou.
Implosion

Pete and Myka return to Washington to intercept a samurai sword that is to be presented to the president, and they discover a competitor for items that belong to the warehouse.
Ship Happens

Henry’s 20-year-old project returns with more on board than it left with.
David
Damian receives an offer that unsettles Tommy; Lou discusses his upcoming wedding plans with Tommy and Needles.
Burnout

Pete and Myka take on a previous agent’s assignment after the man’s corpse turns up in the basement of a St. Louis police station.
If You Build It…

Teenagers construct an odd building in a Eureka field while asleep.
Carrot
A no-nonsense woman, looking for a date, shows up at the firehouse talking trash; Janet offers Tommy an ultimatum; Needles and Lou concoct a battle of the sexes; Sean's medical condition moves lower on his body.
Elements

The theft of a sculpture leads Myka and Pete to a sacred Indian cave holding an ancient secret of creation… and destruction.
It's Not Easy Being Green

A bowling tournament brings a rival science team from Area 51 to town, leaving Carter investigating practical jokes that escalate in scope and destruction as the competition progresses.
Lesbos
The perfect party becomes a nightmare when a herd of brutish women infiltrate the bar. Tommy's love triangle reaches new heights.