This research paper deals with the topic of special effects in science fiction films. Special effects are processed under the genre of science fiction, where specific narrative structures and optical, acoustic and mechanical tricks are used. Thanks to the advancement of technology in the last century, science fiction films underwent a transformation with the development of special effects. CGI type of visual effects appear within scientific modern technology. In addition, green screen is a good choice for a background because it is different from human skin tones and is thus used in the film industry for special effects. To capture and/or record movement, twinkling lights or LED lights are placed on specific body parts of an actor. The Lord of the Rings is an American series filmed in three parts: The Fellowship of the Ring, The Two Towers and The Return of the King. In all three, novelties of the film industry were used and were ranging from prosthetics and props to creatures created using computer graphics. To be exact, 72 miniatures were used in the films which were not really miniatures, but, on the contrary, enlarged "miniatures". Weta workshop developed MASSIVE; a computer program for crowd stimulation used to create automatic battles. To create natural elements such as clouds, dust and wind, the director of photography refined each scene on the computer to strengthen the colors. Cave Troll is the most notable exception in the use of CGI and practical effects. Gollum is the first fully computer-generated character where the film team used a combination of motion capture and traditional animation. Weta workshop used the human muscle system to animate Gollum. For his character, a human voice and movements were used on set, as well as a motion capture suit. Also, ZBrush is a digital tool in 3D modeling for design combining 3D/2.5D modeling, texturing and painting.