Wil Wheaton to Guest-Star on Eureka

Wil Wheaton is set to guest-star on Syfy's Eureka.

Watch full episodes of Eureka in our Online Video Guide

Wheaton will play Dr. Isaac Parrish, the head of a non-lethal weapons lab and a thorn in Fargo's side. The 37-year-old actor will appear in an episode slated for Friday, July 23.

Wheaton — best known for his roles in Star Trek: The Next Generation and Stand By Me— has also appeared on episodes of The Big Bang Theory, Leverage, Criminal Mindsand Numb3rs.

Battlestar Galactica alum joins Eureka

Eureka will debut its fourth season on Friday, July 9 at 9/8c.