"INVINCIBLE - SiIvaGunner: King for Another Day" is a high quality rip of "INVINCIBLE" from SiIvaGunner: King for Another Day. It mashes up the King for Another Day Tournament contenders Dr. Robotnik and "Weird Al" Yankovic.
Jokes
This is an arrangement that combines "Invincible... No Fear!" from Sonic Adventure, "Ending" from Sonic the Hedgehog 3 & Knuckles, "Green Hills Zone" from Sonic the Hedgehog 2 (Game Gear/Master System), "You Can Do Anything" from Sonic CD and "Stranger in Moscow" by Michael Jackson, a song that strongly resembles "Ending". The intro also alludes to "It Doesn't Matter" from Sonic Adventure.