Dr. Faust looks at an hourglass. He wants to remain young so he invokes Satan. Mephisto consents but under the condition that Faust gives him his soul. Faust refuses and Satan makes Marguerite appear, and confronted by Satan, Marguerite and a lion, Faust accepts and becomes a young and elegant cavalier. Faust seeing a cross puts it on the head of Satan, who disappears into the ground and in his place appears Marguerite. Faust takes her hand, leads her outside while Satan, coming into Faust's room giggles as they leave.

Source: Pathe Freres

Doctor Faust consults an hourglass. He looks for a way to become young again but, unable to solve this problem, he invokes Satan. He appears and asks him what he wants. Faust says to him: “Youth”. Mephisto agrees but on the condition that he will give her his soul forever. Faust refuses. Mephisto summons Marguerite. Faust rushes to her feet, but he recoils terrified when he sees, instead of Marguerite, a furious monster. He then finds himself stopped by a she-devil, a devil, and a lion; finally Faust, vanquished, accepts Satan's conditions and immediately becomes a young and elegant horseman. However, the devil still pursues him with his metamorphoses. Faust, seeing a cross, takes it and presents it above the head of Satan, who collapses underground, and in his place appears Marguerite. Faust kisses her hand, takes her by the waist, and leads her outside, while Satan, coming from Faust's room, follows them, sneering, until they leave.

Source: Pathe Freres - Translated

Although the title does not indicate this being a Faust film, the description reveals it to be so, as well as it is one of the first-ever made. The description of this movie matches the ending of "Les métamorphoses de Satan"^[1], and it may be that this one is not a wholly original Pathé Faust movie.