Last week on Resident Alien, Harry and D'arcy (Alice Wetterlund) traveled back in time in an effort to obtain some alien tech ...

That's right, we're talking about Edi Patterson, who returned as Heather in tonight's episode of Resident Alien: "Truth Hurts ...

Heather's reappearance couldn't come at a more inopportune moment, considering the loss of Harry's alien libido.

Here's our updated preview for tonight's episode of SYFY and USA Network's Alan Tudyk-starring Resident Alien, S04E04: "Truth ...