“Conduit to Destiny” is episode eight of season four of Andromeda.
Beka misses a decision point in slipstream, resulting in the Andromeda Ascendant coming out of slipstream at an unscheduled stop – just as said unscheduled stop is having a prison riot. How convenient. The planet’s authorities ask for help, and the Andromeda provides it.
It turns out that Dylan has been to the planet before, back in the days of the old Systems Commonwealth. At that time, it was a much more pleasant place, as the inhabitants were fond of nature; since then, it’s pretty much been turned into an industrial wasteland.
There’s a prophecy that Dylan takes part in.