Me either! OT-- I'm seeing the Lynda Carter Wonder Woman on DVD now (starting w/the third and final go [1978-79] and working back), and I think Lynda Carter comes across more likable as Diana Prince/Wonder Woman (her signature role) than Roy Thinnes ever was in The Invaders.
Not a problem-- so do those from CBS of The Untouchables and The Streets of San Francisco, among others!
Here's how it is from my copy of that Streets one:
Two discs apiece on each of six "pages," one on top of the other (each "page" has the arrangement reversed; one has the top disc over the bottom, and the other, vice versa, all the way through).
That is the way it was indeed, with exceptions now and then where one story took up two episodes (like the two-parter to open up the fifth and final go of The Streets of San Francisco in 1976, "The Thrill Killers," where Michael Douglas' Steve Keller character gives way to Richard Hatch's Dan...
I've seen the extended 60-minute version of the "Beachhead" pilot first, then I'll probably soon jump into the regular episodes (I don't know if that's what you mean or not; maybe I'm incorrect).