The crew is assigned the task of delivering several tons of conversation hearts to Lrrr as a peace offering.
The ship decides to fly into a quasar so that the power of the ten billion black holes in it will merge her and Bender into a perfect quantum singularity.
While searching the conversation hearts, Fry notices that Leela's oxygen supply is critically low.
Completely oblivious to this sacrifice, Leela finishes shutting down the ship's artificial intelligence, returning every system to normal.
Fry awakens and coughs up a candy heart with the message, "U leave me breathless"; the two smile and wish each other a Happy Valentine's Day.
The hearts vaporize, producing a romantic fuchsia-colored radiation that is harmless on Earth and visible during Valentine's Day, but destroys many planets in the process.
Couples around Earth (and Zoidberg, who is inexplicably narrating this section) happily gaze at the beautiful space phenomenon.