Following in his Grandpa Artie’s footsteps, Archie begins to recruit Riverdale’s new volunteer fire department. Toni’s attempt to lure Cheryl out of Thornhill and back into daily life in Riverdale…

Oliver, Diggle and Felicity disagree with Dinah, Curtis and Rene on how to handle Black Siren. The two teams face off and a fight ensues.

Oliver continues his battle with Cayden James. Dinah and Oliver have a major disagreement that endangers the life of one of their own.

The crew of Andromed encounter plague victims infected by a hostile, nanobot-based lifeform out to take over the ship.

The team desperately attempts to stop two Wraith hive ships from reaching Earth. Sheppard must rely on an old foe to rescue McKay and Ronon.

The Atlantis team must decide the fate of a colony of Wraith they have turned into humans. Dr. Weir must defend her leadership when she is evaluated by the I.O.A.

An Ancient communications device renders Daniel and Vala unconscious, sending their minds to another galaxy — where they inhabit the bodies of two people persecuted by the followers of an…