Still no dice, I'm afraid.
A new clue has now been added.
EDIT: Reposting for new page:
It's not:Meanwhile
A Farewell to Arms
Lethal Inspection
Roswell That Ends Well
Neutopia
The Six Million Dollar Mon
2-D Blacktop
Where No Fan Has Gone Before
Bender's Big Score
The Butterjunk Effect
Murder on the Planet Express
T. The Terrestrial
Love's Labour's Lost in Space
The Beast With a Billion Backs
Into the Wild Green Yonder
Bender's Game
A Taste of Freedom
Future Stock
The Sting
The Deep South
Three Hundred Big Boys
Parasites Lost
My Three Suns
Yeah, sorry about that. I got a little excited.
The Farnsworth Parabox
A Head in the Polls
Why Must I Be a Crustacean in Love?
Clues:1. The image contains two characters - neither of which is a regular.
2. The episode is from the Fox run.
3. The episode in question
isn't centred on any one particular character.
4. The episode contains an original music number with lyrics (though not necessarily sung by characters within the show).