Zillo Beast incident

The Zillo Beast incident occurred on Coruscant during the Clone Wars. After discovering the last known Zillo Beast after the Battle of Malastare, the Galactic Republic's scientific community and Supreme Chancellor Palpatine both desired to study the beast's invulnerable scales to create impenetrable armor for the Grand Army of the Republic. However, they decided to conduct this study on Coruscant, and subsequently transported the heavily-sedated beast to a facility.

Doctor Sionver Boll, throughout the course of her examination of the beast, found that she couldn't remove the Zillo Beast's scales without harming it, and thus Palpatine ordered her to kill it. During the attempted execution, the beast escaped and rampaged Coruscant City until it arrived at the Galactic Senate Building to avenge itself on the Chancellor. It was unable to, however, and was killed by a bombardment of poisonous gas from a number of LAAT/is, but not before killing and injuring many clone troopers and civilians.

The next day, the Zillo Beast's carcass was transported on a lift so that further research could be conducted on the body. As she was observing the transport of the body, Dr. Boll, much to her surprise, was ordered by Palpatine to clone the beast.

Text and facts from the “Zillo Beast incident/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.