after cell went to the past to absorb the androids and left android 21, android 21 wanted revenge. She built clones of android 18 in bunny suits and built her own time machine which took 8 months. Android 21 now goes back in time with her android 18 clones and finds cell hosting the cell games. She later walks up to him

Android 21: so…we meet again

the android 18 clones decide to deal with the z fighters while android 21 is confronting cell