Ssssk!

Ssssk! was a telepathic member of a feline species who served as an adjutant of the Galactic Empire. In 4 ABY, Ssssk! was stationed on the planet Seoul 5 under Imperial Captain Drezzel, where he telepathically monitored a pair of Imperial-funded scientists researching there. When the scientists discovered that a type of crystal found on the planet had once been used as a power source, Ssssk! learned of the discovery by reading their minds and reported it to his superiors. The scientists were imprisoned, and the crystals were tested for use in weapons development.

When the smuggler Han Solo arrived on Seoul 5, Ssssk! was sent to find him, and the pair ended up facing off in a subterranean room. Ssssk! attempted to telepathically assault Solo, but the smuggler used a key crystal to defeat the feline. However, Solo accidentally activated all of the crystals using the key crystal, resulting in a blinding flash that the smuggler and scientists used to escape, followed by a large explosion that destroyed the city the crystal was located in and the Imperial forces stationed there.

Text and facts from the “Ssssk!” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.