Tribbles were the lovably cute alien fur balls that couldn't possibly hurt anyone. That is, until Lieutenant Uhura brought just one of the furry creatures onto the Enterprise. The tribble soon had babies. Then the babies had babies. Before long, it seemed like they were taking over the ship. The script for "The Trouble With Tribbles" was the first professional script by noted science-fiction author David Gerrold. His tribbles became an instant fan favorite and have become synonymous with Star Trek.