It leaves a mark; it transforms you. A fierce snowstorm rages as a man makes his way toward a signpost indicating Iping. He enters an inn called The Lions Head, and the people in the bar become quiet because he’s wrapped in bandages. He states—doesn't ask—to the landlady that he wants a room with a fire. This is Dr. Jack Griffin, who will soon cause trouble and be known as The Invisible Man. It stands among the most important of the Universal Monster films that frightened and fascinated audiences long ago. Directed by genre expert James Whale, The Invisible Man combines dark comedy, unhinged science, and genuine wickedness. That’s quite an accomplishment for a film released in 1933, especially when you consider the special effects used. Those effects still look so good they make some of the fake-looking, expensive techniques employed by today's filmmakers seem inferior. John P. Fulton deserves recognition for that. After Boris Karloff declined to play the mad doctor because the role required voice work throughout—except for a brief appearance at the very end—Whale chose Claude Rains instead. Though not tall, Rains had a smooth and appealing voice, and he clearly recognized an opportunity to establish himself in Hollywood. It’s possible that he owes his entire career to that short glimpse of his face at the film's conclusion, thanks to Whale's skillful direction, of course. As was typical for him, Whale assembled a cast of quirky characters who are skillfully portrayed by British and Irish actors. Una O'Connor, Forrester Harvey, Edward E. Clive, and Henry Travers all leave a lasting impression. American actress Gloria Stuart, playing Griffin’s love interest, shines despite her limited screen time. Based on the now-well-known story written by H.G. Wells, Whale and R. C. Sheriff’s (the writer) version remains the best adaptation of The Invisible Man. There are some alterations, like the setting's timeframe, and Griffin isn't as crazy as he is in the book; Wells wasn't entirely happy about that change, even though he enjoyed the film overall. Nevertheless, it stays remarkably close to the original story. Later films, television shows, and other modern versions would appear, but none are as clever or as unsettling as Whale’s. 9/10

Source on TMDB