What is sonic 4 movie?

Sonic the Hedgehog 4 isn't a movie. It's a video game developed by Sega. The actual title of the game is Sonic the Hedgehog 4: Episode I and Sonic the Hedgehog 4: Episode II. It was intended as a direct sequel to the original Genesis/Mega Drive Sonic the Hedgehog games, taking place after Sonic & Knuckles. It aimed to recapture the physics and gameplay style of the original 16-bit games. The game features the return of Dr.%20Eggman as the main antagonist.