The SCI FI Channel has announced the summer premiere dates of four returning series, Sci Fi Wire reported today. The shows include Stargate Atlantis, Eureka, Ghost Hunters International and a new version of Scare Tactics.

Stargate Atlantis– a 20-episode fifth season begins July 11 at 10 p.m. Not only will this season introduce a powerful new race and feature the show’s 100th episode, but in an interesting twist Robert Picardo (as Richard Woolsey) will be taking command. As well, Paul McGillion (Dr. Carson Beckett) returns for five episodes, while Amanda Tapping (Col. Samantha Carter) and Michael Shanks (“Stargate SG-1″‘s Daniel Jackson) will also appear as special guest stars this season.

Eureka – the show’s third season premieres July 29 at 9 p.m. This season digs deeper into the inner workings of Global Dynamics and will feature new characters, including Eva Thorne, aka “The Fixer” (Frances Fisher), whose mission will be to clean up Global Dynamics.

Ghost Hunters International – is returning with seven new episodes beginning July 9 at 9 p.m.

Scare Tactics – kicks off its third season on July 9 at 10 p.m. with two back-to-back episodes. This season Tracy Morgan (NBC’s 30 Rock) joins the show as host.