Star Trek: The Next Generation – Preemptive Strike [7.24]

Ro, now a lieutenant with advanced tactical training, is tasked to infiltrate the Maquis, whose aggressive actions are threatening to plunge the Federation and the Cardassians back into war.  However, Ro grows sympathetic to the Maquis cause–attempting to protect their way of life from Cardassian harassment after their colony was relegated by treaty to the demilitarized zone.  Ro grows particularly close to a Maquis leader called Macius, and after he is killed she betrays the Enterprise and warns the Maquis of an operation to capture them.

Star Trek: The Next Generation – Journey’s End [7.20]

A treaty with the Cardassians puts several Federation colonies into Cardassian space, including one populated by Native Americans who refuse to move.  Wesley Crusher comes aboard the Enterprise, growing disenchanted with Starfleet.  Disapproving of the recent Federation policy, Wesley stirs up trouble for the Enterprise with the local population. 

Star Trek: The Next Generation – Descent [6.26]

During a battle with the Borg, Data unexpectedly finds himself experiencing a flash of anger.  Confused and concerned by his newly discovered capacity for emotions, Data finds himself lured by a Borg prisoner to set him free and escape with him to join his mysterious leader. 

Star Trek: The Next Generation – Chain of Command, Part I [6.10]

When tensions with the Cardassians increase, Picard is reassigned to a special undercover sabotage mission against what is believed to be a new deadly weapon.  Meanwhile, a new Captain comes aboard the Enterprise, causing tension with all the officers by his abrasive manner.