2379

In 2379, the Sixth Doctor and Peri Brown encountered Sil on Thoros Beta. Peri fell victim to Sil-sponsored experiments, and, for a time, the Doctor believed she had been killed by them. The Doctor would later learn that Peri had instead gone to the planet Krontep this year, after falling in love with the warrior king Yrcanos. (DW: Mindwarp, The Ultimate Foe)