Pinkeye's Revenge, Part 1 Grossology : Season 2 Episode 19

An army of rats is attacking the city and Ty is shocked to find out that the one controlling them is Abby. What he doesn't know is that the Abby he saw was an evil clone created by Lance Boil and his new sidekick, Roger Pinkeye, who is trying to get Abby fired as a Grossologist so he can become one.