[[Category:th century| *]] [[Category:s| *]] [[Category:th century decades]] In 2379, the Sixth Doctor and Peri Brown encountered Sil on Thoros Beta. Peri fell victim to Sil-sponsored experiments. For a time, the Doctor believed she had been killed by them. The Doctor later learned Peri had gone to the planet Krontep this year after falling in love with the warrior king Yrcanos. (TV: Mindwarp, The Ultimate Foe)