Bannermen

The Bannermen were a criminal group led by Gavrok. They tried to exterminate the entire Chimeron species.

Tactics
The Bannermen used zap guns as their principle weapon, firing in the general direction of targets as opposed to carefully aiming. They rarely took prisoners without due reason and would not release them willingly. They made use of booby traps as a method of killing there foes, seemingly unconcerned to use such underhand tactics. Bannermen displayed no appreciation for Galactic Law. (DW: Delta and the Bannermen)

Weapons
The Bannermen's primary weapon was the zap gun. They were able to use high-impulse beams to detonate devices such as radio transmitters.

Vehicles and devices
The Bannermen Warfleet was composed of large, three engined cruisers. Their craft possessed scanners that could search for high technology. They had sonic cones to booby trap objects. (DW: Delta and the Bannermen)

Exterminating the Chimerons
After polluting their own world, the Bannermen attacked Chumeria in an attempt to kill all Chimerons and take their world. They killed all the Chimerons, except for Delta, the Chimeron Queen, who escaped. They followed her to toll port G715. Delta escaped from them by boarding a Nostalgia Tours bus.

On Earth
An informer alerted Gavrok that Delta was in Shangri-La camp, Earth, 1959. Gavrok killed the informer through use of a high-impulse beam to avoid paying him. They scanned the area and found high technology landing they attacked what they believed was Delta's hideout but was in fact a trap. Jars of honey fell on the Bannermen and Goronwy's bees attacked them.

The Bannermen reorganised and moved to attack the camp, however the amplified singing of the Chimeron Princess sent them into disarray and Gavrok fell within the perimeter of a sonic cone and was atomised.

The remaining Bannermen were taken prisoner and Delta and Billy placed them on their craft when they set out for space. (DW: Delta and the Bannermen)

Other realities
In a parallel universe one (or more) of the Bannermen spacecraft was captured by the Republican Security Forces and it's technological secrets were plundered by the British government. (PDA: The Face of the Enemy)

Behind the scenes

 * It is unclear if the Bannermen were a race or just a paramilitary group.
 * Bannerman Road is the road where Sarah Jane Smith lived. This may be a reference.