Il serpente di fuoco - Il viaggio

Peter Fonda, Dennis Hopper, and Jack Nicholson engaged in a group LSD trip to prepare to be in the film.

The film's original theatrical prints begin with the following disclaimer, which appears as onscreen text that is read aloud by Bret Morrison: "THE TRIP - FORWARD. You are about to be involved in a most unusual motion picture experience. It deals fictionally with the hallucinogenic drug, LSD. Today, the extensive use in black market production of this and other such "mind-bending" chemicals is of great concern to medical and civil authorities. The illegal manufacture and distribution of these drugs is dangerous and can have fatal consequences. Many have been hospitalized as a result. This picture represents a shocking commentary on a prevalent trend of our time and one that must be of great concern to us all." Because this disclaimer was imposed by the studio and went against Roger Corman's desire to have the film provide a balanced portrayal of drug use, it was removed from the 2011 director's cut.

In 2011, the MGM HD Channel aired a restored and remastered director's cut of the film, which was later released on Blu-ray by Signal One Entertainment in the U.K. in 2015 and on DVD and Blu-ray by Olive Films in the U.S. in 2016. This version runs 82 minutes (three minutes longer than the original theatrical prints, which run 79 minutes) and includes the following changes:

• The opening disclaimer describing the dangers of LSD use has been removed.
• Paul's attempt to intercept Glenn at the go-go club contains more footage, including shots of a painted dancer being carried around on a party-goer's shoulders.
• The final close-up of Paul prior to the closing credits no longer shatters like glass (a studio-imposed symbolic suggestion that his LSD trip has "fractured" his mind).
• After the closing credits, "Synesthesia", the music cue heard at the beginning of Paul's trip, is reused as exit music.

Edited from I vivi e i morti (1960)