Teddy Boy Blues was originally an 1985 Arcade platformer that was later ported to the Sega Master System (which was still then known as the Sega-1000 Mark III) and became one of its launch titles when the system was released in Japan in October the same year. A Sega Genesis version was released only in Japan on Sega MegaNet and in compilations. The title comes from a song released in 1985 entitled Teddy Boy Blues and was performed by Yohko Ishino.
When the game was localized to the US and Europe, the title was changed to simply Teddy Boy.
Connections to Alex Kidd
Teddy has a few strange connections with SEGA's original mascot Alex Kidd. First, an enemy that appeared originally in Teddy Boy later appeared in Alex Kidd in Miracle World. The left image is from Teddy Boy and on the right is from Alex Kidd in Miracle World. This enemy is a daruma which is a popular Japanese Buddhist symbol.
Another connection occurred in the Sega Master System port of the 1986 arcade game Quartet (also known as Double Target). A hidden screen within the game contains Mary, one of the game's heroes, as well as Opa Opa from Fantasy Zone, the main character from Pit Pot, Alex Kidd and Teddy Boy.