Suffering from insomnia, disturbed loner Travis Bickle takes a job as a New York City cabbie, haunting the streets nightly, growing increasingly detached from reality as he dreams of cleaning up the filthy city.

An idealistic but struggling actor finds his life unexpectedly complicated when he stops a robbery while wearing the costume of Captain Avenger, a superhero character of a film he is hired to promote. He decides to dabble at being a superhero only to find that it is more difficult and dangerous than he ever imagined.

This film documents the major directions in modern American art during the first seven years of the 1960s. The keynote is that the artist has expanded his realm from the two-dimentional picture frame, climaxed by the artists of the 40s and early 50s, merged color with sculpture, and sought out modern media to express himself. This has produced the characteristic wide spectrum of interest, ideas, and products in contemporary art.