Background: Neptune Corp. was a very short lived joint venture formed between Check Studios, Charon Television and Alliance Atlantis to help produce and promote Sonic Adventure: Chaos Complex.
Logo: On a black background, we see some blue blotches flash in and out. After it repeats for a while, it forms into the logo, which has the word "NEPTUNE" set in an inclined fashion, and "Corp." right next to it in an opposite position (meant to give a reflection effect).
FX/SFX: The flashing.
Music/Sounds: None. But on TV airings of the movie, it features a drum tune that becomes more intense before ending with a drum roll.
Availability: Extremely rare. Was only seen on Sonic Adventure: Chaos Complex.