Skidmark is a Mini-Con hailing from a long-dead colony world, rescued by the Decepticons and caught up in the events caused by the Unicron Singularity.
- Japanese name: Gauge
- Gauge (Micron Booster, 2005)
- Booster ID number: 3
- Gauge is a redeco of the Mini-Con Nightbeat, transforming into a motorcycle of indeterminable model. Available only as part of the fourth Micron Booster assortment in Japan, Gauge came in a "blind-packed" box that prevented the buyer from knowing the contents of the box until it was opened.
- The packaging for the Micron Booster assortment Gauge was available in does not give any of the Mini-Cons a faction affiliation, so for a time, it was unknown who the Mini-Con associated with. It wasn't until he was shown in the fiction Force of Habit through the Fun Publications Official Transformers Collectors' Club that "Skidmark" was officially pegged as a Decepticon-allied Mini-Con and partner to Runamuck.