Or if the aliens shown on the screen were real aliens?
As you've just read, that was the premise of the short-lived (two issues) Ziff-Davis series Lars of Mars!
Created by Jerry (Superman) Siegel and Murphy (Buck Rogers) Anderson, this premiere story from the first issue of his own title (which was #10!) established the somewhat-silly premise.
During his run, Lars battled Commies, crooks, and other aliens while protecting his "secret identity" from his nosy producer.
You'll be seeing all of Lars' stories here over the next few months.
Watch for them!
The cover paintings for both issues of Lars of Mars were painted by Allen Anderson, who was not related to interior artist Murphy Anderson!
Here's a "Six Degrees of Kevin Bacon"-style fact (done in four degrees)...
1) Ziff-Davis also published a short-lived adaptation of an actual sci-fi tv series, Space Patrol, illustrated by Bernie Krigstein.
2) Krigstein illustrated the first issue of another Ziff-Davis sci-fi series: Space Busters!
3) Bernie was replaced on interior art for the second (and final) issue of Space Busters by...Murphy Anderson!
4) Allen Anderson did the painted cover for the Space Busters issue illustrated by Murphy! (Norm Saunders had painted the first issue's cover!)
featuring the covers of both issues of Lars of Mars!