Bubblegum Crash takes place in the same universe as the Bubblegum series. The characters act differently. Sylia isn't moody anymore, now she's very friendly and has an upbeat attitude. Priss, she is happy and laughs a lot which was not consistent with the other series where she was always dead serious about her job. Nene isn't cute or bubbly anymore, now she's a bit like a tomboy. They all look different as well, they are all less attractive looking. The boomers are also different, now dumber with very little intelligence, they all talk like programmed machines and not like advanced A.I., again there is a loss of continuity between series, given that Crash takes place after BBGC 2040 the boomers should have been smarter and more advanced, but here they seem to have devolved back to primitive robots. This affected the action sequences which are not as intense because the Knight Sabers now easily destroy the dumb enemy boomers. A roboticist creates a new kind of robot, Adama. It has more intelligence and acts almost human, everybody wants to get Adama for themselves, so the Knight Sabers step in and protect Adama and save the city. The story and the overall quality of Crash is much inferior to the other series.

Related series are;
A.D. Police
Bubblegum Crisis
Patlabor