Eureka: Season 1, Episode 2

1 - 2: Many Happy Returns

Carter and the rest of the town are surprised by the arrival of Susan Perkins, a woman whose funeral they've all just attended. Nathan Stark, Allison's ex-husband, becomes head of GD. Meanwhile an amorphous being causes electrical disturbances all over town. The being is found to be the scientist who created the tachyon accelerator and is now caught between seconds, and the woman who died is found to be a clone, and the woman who showed up is the real one.