They said it would never happen! Nearly five decades and 1500 episodes in the making! The two greatest science-fiction properties of all time cross over for the first time in history, in STAR TREK: THE NEXT GENERATION/DOCTOR WHO: ASSIMILATION! When the Federation's most terrifying enemy strikes an unholy alliance with one of the Doctor's most hated antagonists, the result is devastation on a cosmic scale! Spanning the ends of space and time itself, Captain Jean-Luc Picard and the crew of the USS Enterprise find themselves joining forces with the Doctor and his companions, with the fate of the galaxy hanging in the balance!