Izumi is voiced by April Stewart!
I thought it was a good episode, I loved the Korra Zaheer stuff. The vines just needed to state why they were attacking despite us knowing it was because of the swamp. Bolin and Opal part I adored.
My problem is we have four episodes yet and stuff needs to happen. This entire episode reminded me of Endgame how I kept checking my watch to see how much episode was left. I think I will be doing that for all the remaining episodes. I feel like there is much to cover with Varrick, Zhu Li, Bei Fong reunion, Bataar Junior character explanation, Bomako parents stuff, Asami parents stuff with Hiroshi, Is Wu good or bad, who is Izumi, will we see the Fire Nation, and enough time for Korra to Kuvira justice. Wow, that was alot.