Crichton is forced to go to extreme measures to destroy the Peacekeepers' wormhole research, and is betrayed to Scorpius. Two comrads must make the ultimate sacrifice.

Sabrina's plan to get Zelda nominated for Professor of the Year turns ugly when the committee discovers Zelda attended college in 1873 and fires her from her dream job. Meanwhile Sabrina is wracked with guilt and ends up stuck on an Other Realm 'guilt' trip until she can work through her issues.

Max's life is placed in more danger than ever before when she is hunted by the one person who knows her better than anyone - her clone. Though even the existence of this exact replica is news to Max, she quickly realizes the imminent danger from an individual who can get inside her head and infiltrate her life like no one else. Dealing not only with this new threat but also the disintegration of her relationship with Logan and Joshua's disillusionment over not being able to go out in public, Max must race against time to figure out how to stop this deadly enemy before it's too late.

Mystique breaks a mysterious young girl out of an asylum and brings her to the Brotherhood House.

The closure of the department continues to cause more trouble with ambulances queuing outside as team battle to save the life of an MP's son.