The story is a reworked version of Sonic Unleashed's plot. It starts with Sonic being turned into a Werehog by Doctor Eggman and meeting Chip. However, other characters from the franchise, such as Team Dark and Knuckles, have a role in the story as well.
This comic provides examples of:
- Alternate Universe Fic: The comic is a reworked version of Sonic Unleashed with more characters added in.
- Blah Blah Blah: In the third panel of page 41, Shadow hears Sonic's speech devolve into this as he stops paying attention to him.
- Lions and Tigers and Humans... Oh, My!: The comic adds in Funny Animal extras alongside the humans, making it clear that the various species co-exist together.
- Oh My Gods!: Knuckles uses "Chaos" in this manner when he says the line "Chaos have mercy".
- The Remake: The Heart of a Monster is a remake of an unnamed Sonic Unleashed comic by the artist.