Babylon 5 enters the world of televised movies with Thirdspace, set in the middle of 2261 after the Shadow War.
After an engagement with the Raiders, Ivanova and her Starfury squadron come across a mysterious artifact floating in hyperspace. When they bring it to Babylon 5 to learn its secrets, and after the arrival of an IPX team, some of the station residents begin behaving differently - and even dream of a mysterious tower in an alien place.
Lyta attempts to destroy the artifact before revealing its deadly secret to Sheridan and Delenn - a major mistake made by the Vorlons a long time ago and one that now threatens everyone again. They created the artifact and paid a huge price for their arrogance.
Once the artifact is powered up, it opens a doorway to another realm, a 'thirdspace' beyond hyperspace. A violent alien race from the other side, who believe only they have the right to exist, come through and attack the fleet that has been pulled together at Babylon 5 while John sets out to destroy the artifact for good.
Thirdspace provides a nice break from the storyline of the show, while slotting in almost perfectly (i.e, very few continuity errors) mid-season. It has the ability to be watched with very little knowledge of the B5 universe for those who might not be following as closely.
There is a bit of a 'slow burn' in place as the artifact is discovered, strange things start happening and then the last half an hour or so is where everything reaches a climax in a stunning battle sequence to take out the artifact.
Thirdspace has a very different feel from the rest of the series with the story, the aliens and the music provided by Christopher Franke.
It's enjoyable and a little scary (in a different way from the Shadows), but takes a while to get into gear for the final showdown and sits outside the important story arcs.
I give it a 6/10 overall.