Autons, animated plastic automatons controlled by the malevolent Nestene Conciousness. The Autons can be found scattered across the Wasteland at sporadic intervals, but more specifically at 3 unique locations implemented for the mod.
Code-named; Plastic Fantastic, the "side quest" sees you stumbling across the detection of 3 Nestene Transmitters from somewhere across the Mojave
Objective? Find all 3 and deactivate the signals.
When each transmitter is deactivated, it leaves a piece of schematic that when brought together, provides the chemical solution to an Anti Plastic. This can be used to generate a formula, which in turn when fed into the TARDIS recyc unit will generate 10 Anti Plastic vials to be thrown at Auton Duplicates, instantly defeating them.
Note: Whilst classed as a "side quest", this will not appear in your Quest logs as a mission.