Infinity's Child (1999)

The Phleig exploration vessel, Infinity's Child, is discovered adrift on the edges of explored space. Its crew of thousands are mysteriously missing. The ship's logs point to an ancient legend of a "gateway world" thought to be an entry point to realities beyond. The Phleig discover the location of this world and launch a massive mission to explore it. What they find when they arrive is nothing like they ever imagined...