After the events of Gavos, the malfunctioning EV taskmaster droid leading the destructive robot uprising was destroyed in the crew's break-out from the mining colony. In what the crew has considered a "fitting" punishment, they've put the droid's memory core in the chassis of an MSE-series droid. Commonly known as a "Mouse" droid.
MSE-6-EV971, "Icarus"
MSE Droid