Gene Roddenbury's Andromeda: Through the Looking Glass by Josepha Sherman
Andromeda is weaving her way through a maze of space anomalies and worm- holes, when a sudden attack forces the ship into an anomaly. Once on the other side, the crew finds they have slipped into a different dimension, and suddenly the Dylan they know is gone, replaced by a very different Dylan. The crew must choose between an act of obedience or an act of mutiny as they follow a dangerous course into deep space with a foreign captain they cannot trust. Meanwhile, Dylan finds himself on a strangely different Andromeda in another dimension, one where he may have to sabotage his own ship if he hopes to return to the ship he knows and loves. Exciting space adventure with Beka Valentine, Trance Gemini, and the rest of the crew lies dead ahead.