Thunder Force II (サンダーフォースII) is a scrolling shooter developed by Technosoft. It was first released in Japan on October 15, 1988 for the Sharp X68000 computer. A year later, it was ported to the Sega Mega Drive/Genesis game console and released in Japan (under the name Thunder Force II MD), Europe, and the United States. Thunder Force II was one of the six launch titles for the U.S. Genesis release. It is the second chapter of the Thunder Force series.