The Monster Jam Speedsters
"Monster Jam Speedsters" is a term used in the Monster Jam "Monster Truck" event (see: MonsterJam.com). It is the name given to customized Polaris Razor off road UTV's run at select Monster Jam events.
There was originally eight created for the original More Monster Jam (2015) tour. That number was expanded to ten in the summer of 2015 then againg to sixteen in 2016 and to 24 in 2017.
Each one is customized to look like a corresponding race truck. They are driven by the same driver as their corresponding truck. They are run in head to head brackets and obstacle course competitions. There are multiples of New Earth Authority (N.E.A Police), Grave Digger, Zombie and Scooby Doo. The rest have varying paint designs or are designed after different trucks.