The Regents themselves are a surprise. Ordinary looking folk, but with a whole lot of power. Again, Sheppard has a nice bit with the "What did you expect?" line. The softly spoken group of people who made an impact without standing out in a crowd gets the point across. Will we see Valda again? It's hard to say. He would probably do best popping up from time to time rather than each week.
By the way, is Artie married? He mentioned a father a bit back, but I thought I heard him mention a Nina in the small talk with Mrs. Frederic. Of course, it could very well be Leena.
Underlying all is McPherson, who Artie used to be friends with. He is taking his training as a former Warehouse agent and wreaking havoc. Artie might just be the only one who can stop him. Roger Rees does not make an appearance this episode as the cunning villain, but his picture shows up with the word 'wanted' written across it. He's completely ruthless, which should make for some interesting viewing.
With only two episodes left in this season, I have to assume McPherson shows up in both. Rees apparently signed a contract for a three-peat. The Secret Service agents and their junior partner might be in for more than they think. Every mission so far has been fairly tame. McPherson is willing to kill anybody who gets in his way, which he has already proven ("Implosion"). What's to stop him from trying to kill one of the Warehouse agents?
Keep watching for more missions and answers to the biggest questions Tuesdays on Syfy!