Thanks, guys - that's very helpful indeed! As soon as I saw that "Mr. Risk" comic, I knew I wanted to make extensive use of this peculiarly deadpan character with his ever-present pipe. But I assumed that somebody this obscure - heck, he doesn't even have a wikipedia page! - who only got to star in two issues of his own comic probably didn't appear anywhere else. I hoped you might be able to tell me about a few backup strips and maybe double the number of images I had. Instead, there turns out to be all this material scattered throughout many different titles, which means I can turn him into the hero of the entire story, or at least the first act (I have no idea how long it'll eventually be).
And an extra thank you to JVJ for identifying the artist as John Buscema. It'll be very useful to have plenty of other strips about unrelated characters and/or in other genres but drawn in exactly the same style. The fact that Buscema drew romance as well as hard-boiled tough-guy action is particularly useful. It means that the unflappable hero can have a running gag whereby everyone around him, especially the women, massively overreacts to absolutely everything, and because all the artwork's by the same guy it'll look as though the panels were drawn that way in the first place.
crashryan, "Super Duper Supermen" rings a bell. It's a long time since I saw those Bob Monkhouse strips, but they were in a compilation volume, and I think it may have been that very one, unless my memory's playing tricks, and the title only sounds familiar because it's a line from the Spike Jones song "In Der Führer's Face". If I remember correctly, there's a strip called "Tornado On The Atom Planet" featuring monsters which - well, let's just say that you'd have to be very young indeed not to spot something odd and rather rude about them...