Seska – the Cardassian pretending to be a Bajoran pretending to be a Maquis – is back, and now she is with one of the Kazon sects, looking to a) unify power and b) give Chakotay a hard time.
She succeeds a little in both categories, causing Chakotay to sneak behind Janeway’s back and cause a lot of aggravation. Janeway really outta get rid of that guy, he’s a total douche.