Karlen VO? He's not in this one.
Louis Edmonds did the opening voiceover for this ep. Once the switch from the Alexandra Moltke-only voiceovers was made, no voiceovers were ever done by any actor who wasn't in an ep. In fact, the whole reason DC ended the practice of having Alexandra do all the voiceovers was because she had to be paid even if Vicki didn't appear in an ep - but if an actor was already in an ep, he/she didn't get any extra pay.