High Quality Content by WIKIPEDIA articles! "Scorpion" is a two-part episode of Star Trek: Voyager, the cliffhanger between the third and fourth seasons composed of the 26th episode of the third season and the first episode of the fourth. It introduced Seven of Nine and Species 8472 to the series, and is generally regarded as the two most popular episodes of the entire series and its best cliff-hanger by Voyager fans. The two segments of the episode are rated 4.6/5 and 4.7/5 respectively on the official Star Trek website as of September, 2009.