Prehistoric Isle (presented as Prehistoric Isle in 1930 on its title screen) sends intrepid pilots on a mission to investigate the disappearance of ships in the Bahamas, only to find Greenhell Isle, populated with dinosaurs and other creatures long believed to be extinct. Naturally, "conduct an investigation" translates to "annihilate the entire island," and the pilots proceed to exterminate everything they come into contact with, which includes an impressive array of creatures across multiple stages. Prehistoric Isle mixes up the standard shoot-em-up formula with stages that scroll in different directions, while your plane always faces to the right, and features an R-Type-like satellite that can be repositioned.