 Much of the reliance on these effect-driven blockbusters was due in part to the "Star Wars" films at the advent of this decade and the new cinematic effects it helped to pioneer.The teen comedy subgenre also rose in popularity during this decade.In the US, the PG-13 rating was introduced in 1984 to accommodate films that straddled the line between PG and R, which was mainly due to the controversies surrounding the violent content of the PG films "Indiana Jones and the Temple of Doom" and "Gremlins" (both 1984).