Leela becomes obsessed with hunting down a mysterious, four-dimensional space whale.
Fry nurtures an alien egg that hatches into a horrific monster.
The crew uncovers a dark secret concerning a covert mission undertaken by the Professor and Dr. Zoidberg many years earlier.
Fry's sneezing reintroduces the common cold to the world of the future, with devastating consequences.
Bender evolves into a godlike being after vastly increasing his processing power.