Godzilla vs. Megalon (ゴジラ対メガロ Gojira tai Megaro) is a 1973 Japanese science fiction kaiju film produced by Toho. Directed and co-written by Jun Fukuda with special effects by Teruyoshi Nakano, the film starred Katsuhiko Sasaki, Hiroyuki Kawase, Yutaka Hayashi, and American actor Robert Dunham. It was the thirteenth film in the Godzilla franchise. Heavily influenced by the tokusatsu superhero TV shows of the time, the film had Godzilla essentially acting as a costar to a huge robotic superhero character called Jet Jaguar.
The film was released theatrically in the United States in the summer of 1976 by Cinema Shares. Afterwards it became the only Godzilla film to receive a television premiere on a major U.S network, as NBC aired it on prime time television in the summer of 1977, where it was hosted by actor John Belushi dressed in a Godzilla costume. (source)
King Kong is a 1976 American monster thriller film produced by Dino De Laurentiis and directed by John Guillermin. It is a remake of the 1933 classic film of the same name, about a giant ape that is captured and imported to New York City for exhibition. Featuring special effects by Carlo Rambaldi, it stars Jeff Bridges, Charles Grodin, and Jessica Lange in her first film role.
The remake's screenplay was written by Lorenzo Semple Jr., based on the 1933 screenplay by James Ashmore Creelman and Ruth Rose, from the original idea by Merian C. Cooper and Edgar Wallace.
The film was the fifth highest grossing film of 1977 according to box office statistics compiled during its release by Variety, although decades later Box Office Mojo published a list indicating it was the 7th highest grossing film of 1977.
This film is the only one in the King Kong film series to feature the World Trade Center towers rather than the Empire State Building. (source)