I just watched Bill and Ted's Excellent Adventure this evening for the first time in many years. As they head through the Circuits of History, we see these green things on the circuits:

green things on circuits

At first, they look just like sparks (similar to the blue lightning/sparks also seen). However, they appear to crawl around the circuits. At one point in the movie (just after they visit the future), Bill and Ted notice the green things: Ted says, "What is that?" and Bill says, "I don't know." We then see that they are headed for one of these green things, which looks quite monster-like, and almost reaches out to grab the phone booth:

green frog-like monster

I don't think the green monster is seen again after this, nor is it referenced in the dialog. What is this green monster in the Circuits of History?

  • I always interpreted the "What is that" part to be referring to the giant loop that they whoosh through seconds later. – Roger Sep 24 '14 at 13:32
  • @Roger After watching that scene again, I think you might be right. – Ben Miller Sep 25 '14 at 3:19
  • @Roger - Given that the green thing was added in post-production, you're almost certainly correct. – Valorum Oct 9 '16 at 9:55

My good friend Richard Malzahn (Miniature Photography Supervisor and Software Programer for Perpetual Motion Pictures, the VFX house that created the 'circuits of time' sequence) was kind enough to answer this one.

Suffice to say, there's no in-universe explanation for the creature, other than that it exists between the circuits. Out of universe, it was an attempt to strengthen the tension in a scene that the studio thought was "weak".

I hope he won't mind me quoting the relevant parts verbatim.

The stupid green monster-frog-thing was the studio attempting to "fix" what they thought was a sequence that was "not working". The circuits of time sequence was one of the first computer generated sequences in motion pictures. The entire sequence was generated without the phone booth and then the phone booth was shot via motion control and composited into the shot on an optical printer.

When the sequence was complete, the studio was (needlessly) nervous about the film as a whole and decided that the circuits of time sequence was weak, so they foolishly decided to add a "quick fix" which was the stupid green-frog-monster.

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