The role of the scientist has varied considerably in the science fiction film genre, depending on the public perception of science and advanced technology. Starting with Dr. Frankenstein, the mad scientist became a stock character who posed a dire threat to society and perhaps even civilization. Certain portrayals of the "mad scientist", such as Peter Sellers's performance in "Dr. Strangelove", have become iconic to the genre. In the monster films of the 1950s, the scientist often played a heroic role as the only person who could provide a technological fix for some impending doom. Reflecting the distrust of government that began in the 1960s in the United States, the brilliant but rebellious scientist became a common theme, often serving a Cassandra-like role during an impending disaster.