The Enterprise-D and The Voyager meet in the Beta Quadrant. Both believe the other needs to be destroyed for some strange reason. Communication with Starfleet is impossible.
The Enterprise-D has onboard Reginald Barclay after his intelligence was fully enhanced by the Cytherians. The Voyager has the 29th century Borg onboard.
Each ship has their normal complement, but the aformentioned individuals are the acting captains for this scenario.
Also, calling upon allies is not possible, and this is the 4th season version for both ships. Who wins this battle?