Amy Rose
Two characters introduced in the game, Amy Rose and Metal Sonic, became recurring characters in the "Sonic" series. Metal Sonic appeared as a major antagonist in "Knuckles' Chaotix" (1995), "Sonic Heroes" (2003), and "" (2012), whose story heavily connects to "Sonic CD". Amy Rose most notably appears in "Sonic Adventure". The "Sonic CD" animated sequences were included as bonuses in the compilation "Sonic Jam" (1997), and "Sonic Boom" was used as one of Sonic's themes in "Super Smash Bros. Brawl" (2008).