I like the idea of the Capellans being descendants of a "failed" Earth colony. Maybe they were escaped "Augment" renegades, or, like the Neo-Transcendentalist Bringloidi of the failed S.S. Mariposa expedition (
TNG's "Up the Long Ladder"), their ship had trouble and the colonists had to bail out on this planet without the benefit of their technology.
I actually like to think of the Capellans as a combination of these ideas. Maybe, like Khan, the sleeper ship S.S. Capella arrived at Alpha Aurigae IV with a full payload of hibernating eugenic supermen, but their ship crashed (
"Planet of the Apes"-style) and they were forced to live primitively without any technology. With their leadership all having perished in the crash, the aimless colonists fought each other until the rudderless settlement was in chaos and near starvation. (Even an Augment has to eat.) The result was a new generation of filthy, under-educated children whose factional parents formed the Ten Tribes of Capella. Because the colony was made of Earth's descendants who found and settled the world with the use of a space vessel, and because the colonists were self-described outlaws that Earth did not have the inclination to reclaim, the Capellans occupied a weird grey area of simultaneously being both covered by and exempt from Earth's laws in general and the Federation Prime Directive in particular. In essence, the Federation would be in the awkward position of treating Capella as both an "orphan" world and an "alien" society to be dealt with diplomatically.
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As for the notion that some of the scenes were jarring in the episode, this never bothered me. It was plainly understood from the ep's teaser that the Capellans were violent and unpredictable. After the verbal confrontation between Aka'ar and Ma'ab, it seemed to be a standard TOS plot flow for the Klingon ship to start making mischief and for the tribal settlement to explode with violence. The plot thickens...
One thing that isn't made clear is whether Capella is in Federation space or not. It's never firmly established (from what I could figure out, anyway) where Capella is in the TOS Universe. There are three possibilities:
- The Capellan star system is in Federation space, but occupies a strange status as a failed colony/non-alligned world.
- The Capellan star system is in the disputed area between the Federation and the Klingon Empire, along with Arcanis, Organia, Donatu and Sherman's Planet. This would make Capella ripe for the picking.
- The Capellan star system is a distant world, removed from both the Federation and Klingon sphere of influence, and the only reason either side would bother with it is the discovery of the valuable topaline mineral.
It's understandable that people will look at an uber-60s ep like "Friday's Child", with its way-out costumes and its "oooochie-wooochie-coooochie-coo" and roll their eyes. You could do that with the better-written "A Private Little War", as well. (I regard "Friday's Child", "The Trouble with Tribbles" and "A Private Little War" as a kind of loose Federation-Klingon intrigue anthology. They're like companion stories.) Kras, Krell and Arne Darvin seem to personify the proxy-conflict nature of these stories, all the merry while the Enterprise either evades the mysterious Klingon ship, or the Klingon ship evades the Enterprise, or "you have six hours to get your ship out of Federation territory" and let's not bother showing the Klingon ship anyway because it was not in the budget.
The biggest issues I had with "Friday's Child" weren't the costumes or the jarring violence or the missing Klingon ship (later "fixed" by "remastering"). It was the notion that the Federation
ordered the Enterprise to this planet to disrupt the lives of the primitive inhabitants for a mining treaty. Clearly that mineral (and getting the best of the Klingons) was more important than the Prime Directive. (Of course, this can be explained/retconned away, see above.)