Delta brainwave

The effects of the absence of the Delta Brain Wave in Fry.

The Delta Brain Wave is generated by all animals (with the exception of Philip J. Fry), all robots, and certain trees. The Brain Spawn attack the Delta Brain Wave.

Additional Info

Mentions

Since the Delta Brain Wave is generated by every character but Fry, it is technically present in every episode (as there is at least one more character in every episode).

• "The Day the Earth Stood Stupid" (3ACV07)
  
• "The Cyber House Rules" (3ACV09)
  
  (possibly)
• "The Why of Fry" (4ACV10)