This Island Earth (1955)

This Island Earth. A stylized version of the Metaluna Mutant seen in this film. Though a target of the Mystery Science Theater group, this film is a 1950s classic, if for no other reason than having one of the coolest looking aliens of the decade.

Kit Maker: Monsters in Motion

From Wikipedia:

This Island Earth is a 1955 American science fiction film directed by Joseph M. Newman. It is based on the novel of the same name by Raymond F. Jones. The film stars Jeff Morrow as the alien Exeter, Faith Domergue as Dr. Ruth Adams, and Rex Reason as Dr. Cal Meacham. The film was one of the first major science fiction films to be made in Technicolor. In 1996, This Island Earth was also edited down and lampooned in the film Mystery Science Theater 3000: The Movie.

When initially released, the film was praised by most critics, many[who?] citing the special effects, well-written script and eye-popping color (prints by Technicolor) as being its major assets.

Many critics[who?] cite the special effects as the strongest element in This Island Earth, which were ground breaking for their time and are considered by many film buffs to be comparable to modern special effects.

The film was one of the last films to use the three-strip Technicolor filming process. Even during production, the film’s special effects were shot on the more conventional Eastman color process, which most studios had already adopted.