Classic metal Sonic first appearance to me it's kind of confusing but he appeared in Sonic CD as the villain created by dr.eggman (a.k.a Robotnik if I spelled that right) and is fast just like Sonic he can fly charge at his opponents and spindash at his opponents also and more also he kidnapped a girl named rosy the rascal (a.k.a Amy rose)and in the boss fight you have to race against him plus you're also running away from Eggman's machine that blast a beam at the I think road or something like that and he is also trying to kill you both and who every wins get's amy but who loses die but then he's last appearance is Sonic generation it's like the same but with out winning for the girl you're running away from he but then at the end you kick him and he is destroyed but you won't get to see him in other games but I really like this character I will probably talk about modern metal Sonic but yeah.also he appears in Sonic Mania adventure in part 5 the last episode fighting Sonic, tails,Ray and mighty then turns super and more stuff then boom knuckles punches him and Eggman and that's it in the other episodes he only appears in the endings and in episode 4 he fought mighty and Ray mighty lost to him plus he can scratches his foes and that's about it again.