Release Message:  The Enterprise C enters the Enterprise D's time and space continuum, where they find Picard and crew in a constant state of war with the Klingons, and only Guinan knows it. Featuring Denise Crosby as Lt. Tasha Yar.

Description:  The Enterprise C enters the Enterprise D's time and space continuum, where they find Picard and crew in a constant state of war with the Klingons, and only Guinan knows it. Wikipedia: the appearance of the predecessor of the current Enterprise leads to an alternate time-line.