Enemy of the ThunderCat Jaga.
Ratilla is an ancient member of the Rat people
Ratilla first appeared in the original 1980's ThunderCats series
Ratilla later appeared in the current series during a flashback where it was shown that much like in the original series he wielded Mumm-Ra's sword, the Sword of Plunn-Dar. In the current series it was shown he was killed in battle with Jaga.