"Relics" was my favorite episode of TNG that featured a character from TOS. The others were all like "HEY! SPOCK'S HERE! LOOK! IT'S SPOCK! OOOOOOOO! SPOCK! HEY EVERYBODY! SPOCK! SPOCK! SPOOOOOOOOOCK!" While "Relics" had a good story that would have worked without Scotty. His presence just enhanced it.