9k is a Maximal in the Beast Era portion of the Generation One continuity family.

9k is a captain in the highly trained Maximal Command Security Force. His job is to uphold the will of the Maximal Imperium on Cybertron in the name of the Pax Cybertronia. A highly decorated officer, he prefers to stay in the field with his troops despite his high rank. His skill with energon weapons makes him a dangerous opponent.

Fiction

After a Predacon defeated three Maximal cops, 9K had a one-to-one combat with him. It seems 9K was defeated, too. Theft of the Golden Disk

Notes

• 9k — like all of the MCSF — uses the Cybertron-series Clocker toy as a base, though no official 9k toy exists (and probably never will). His color scheme (and name) is based on the Beast Wars Maximal K-9, though they appear to be two separate characters. Litter-mates, perhaps?