You will Watch Grossology Season 1 Episode 19 online for free episodes with HQ / high quality. Stream cartoons Grossology Episode 19 Vein Drain. When people start showing up with bite marks on their necks, Ty and Abby suspect vampires. But when they dig a little deeper, they discover that it’s another kind of bloodsucker that’s causing trouble – leeches! Worse, Abby is deathly afraid of these hungry invertebrates.