Barbara Baine was quite a stunner in her youth.
No kidding. I'm presently rewatching
Mission: Impossible and I'm just a couple of episodes into Season 2. Yeah, she was a looker. It's amusing to see so many smoking in the shows including the women and yet I can see how if someone smoked enough (and maybe drank as well) it could take its toll on one's looks.
Not to get too far off topic, but rewatching this show re-affirms to me how smart it was to get Peter Graves replacing Steven Hill. Graves just had more screen presence, likability and range while Hill seemed rather stiff. It's somewhat analogous to
Star Trek replacing Jeffery Hunter with William Shatner. Graves, like Shatner, brought more vitality to the screen. I also find some interesting parallels/connections with
Star Trek. Just as
Star Trek was out to do science fiction straight so was
Mission: Impossible out to do the spy genre in similar fashion. They were two very smart shows (coming out of the same studio, Desilu) at the same time. And both executive producers---Gene Roddenberry and Bruce Geller---gave their respective higher-ups headaches.

Also listening to the music it often sounds like some of the same people were writing music for both series and perhaps using the same orchestra. One thing you can't escape noticing is how many guest characters appeared on both shows---this was not happenstance. The casting guy hired at Desilu found a way to save money by offering many of the guest actors a package deal for them to appear on two or three episodes for a set fee rather than be paid by a per episode basis. This meant that they could appear on either
Star Trek and/or
Mission: Impossible in short order. This gave the actors added exposure while allowing to Desilu to save some money.