The coolest thing about Thundarr's post-
apocalypse, to me, was the fact that the celestial event that had ruined
civilization also split the
moon in two. The two half-moons, with a little debris between, were nearly always visible above the action in Thundarr's nightscape. I remember many a gradeschool dialogue about whether this was possible. My science-leaning peers decreed that any gravitational effect powerful enough to rend our moon in
twain would leave no life behind on our planet, not even the tough, wookie-like Ookla. Or if it did, the resulting gravity
weirdness would play havoc with Earth. I always wondered how it could stay split...it seemed to me that its own weight would cause it to fall back onto itself.
However, I was able to suspend disbelief throughout the whole series and get my Saturday-morning light saber and wookie fix during the excruciating lull between Star Wars installments.
Thundarr's light saber (or "sun sword," as it's called) was held magnetically on a metal greave he wore on his left forearm. When not active, it was just a bladeless hilt. Note that Thundarr never used it on living beings--he only "killed" robots.