In this study, the scripts of 288 television episodes were analyzed to determine the extent to which vocabulary reoccurs in related and unrelated television programs, and the potential for incidental vocabulary learning through watching one season (approximately 24 episodes) of television programs. The scripts consisted of 1,330,268 running words and had a total running time of 203 hours and 49 minutes with a mean running time of 42 minutes. The vocabulary from a single season of six individual television programs (142 episodes) was compared with six sets of random television programs (146 episodes). The results indicated that, when there are an equivalent number of running words, related television programs are likely to contain fewer word families than unrelated programs. The findings also indicated that word families from the 4,000-14,000 levels were more likely to reoccur in a complete season of a television program than in random television programs. The percentage of low-frequency word families encountered 10 or more times was higher, and the percentage of word families encountered once was fewer in all six programs than in the random television programs. (Contains 7 tables and 1 footnote.)