Well that has cleared the 3 #Riddick movies out of the TiVo, watched in order for the first time.
Some of the dialogue in the third movie is Riddick being oblique, and only really makes sense if one has actually seen #PitchBlack, which as I recall wasn't the case when I first watched movie 3.
It's basically a #SciFi slasher movie with a bit of man+dog buddy movie (Sci-Fi style) mixed in. #TheChroniclesOfRiddick is still the best one of the three by a significant margin.
It's interesting that movie 1 had Australian locations and several Australian actors, and movie 3 was Canadian locations and mostly U.S.A. actors.
Also interesting is that the set-up for what we know about the forthcoming movie 4 has been dangling at the end of movie 3 for 13 years. Movie 3's dialogue established a 10-year in-universe gap from movie 1, the real world gap being 13 years. I wonder whether it is going to be another decade in-universe.
The sort of #Mithridatism that is in the 3rd #Riddick movie is theoretically possible, as it can be done with snake venom. But it does rather hinge on how well the biochemistry of the alien world matches Riddick's Furyan #biochemistry.
Of course, it's a bit of a suspension of disbelief point in the Riddick universe that all planets seem to be capable of supporting Terran life; even Crematoria which has (per the effects department) a continuous semi-circle of combustion circling the planet once per day eating up the oxygen in the atmosphere. (And, magically, no convection currents causing a permanent windstorm.)
Riddick certainly seems to be able to survive on the alien organisms as food.
Consistent planetology and ecology is not this franchise's strong suit. Vide the organisms in #PitchBlack destroying their own food source entirely, yet being able to survive in large numbers for decades. In the real world, overpredation causes population collapse.