Star Trek: Hidden Frontier (2000)

S2E2 Yesterday's Excelsior

In an alternate scenario, the original USS Excelsior, commanded by Captain Hikaru Sulu, unexpectedly plunges through a temporal anomaly while en route to support Captain Kirk at Camp Khitomer. The Federation has succumbed to the Borg, having faced the wrath of the Q Continuum for their severe retaliation against the vulnerable Klingon Empire following the assassination of the Federation President. Now, the Battlestar-class USS Excelsior leads the remnants of the Federation on a quest for refuge, but the arrival of the original Excelsior could offer a chance to achieve more than mere survival.