Sonic the Hedgehog in Castle Robotnik is the fourth Sonic book written by Martin Adams. It was published in 1994 by Virgin Books.

Synopsis

It's the FrankenSonic monster! In this, the fourth book in the series, Doctor Robotnik plots to defeat that pesky hedgehog once and for all — by building a bolt-together version of Sonic.
Werewolves, vampires and mummies lie in wait for Sonic and his sidekick Tails as they venture into Robotnik's mountaintop castle for a cataclysmic confrontation.

Appearances

Characters:

Plot

1: Terror in the Dark

2: A Visitor in the Night

3: Robotnik Eggsplains

4: Bring on the Eggstras

5: I used to be a werewolf But I'm all right Now-oooooh!

6: We're off to see the Wizard

7: The Butler did it!

8: Dinner with a Vampire

9: Nightmare on Robotnik St.

10: Last Action for a Hero?

11: The Rat Pack Movie

12: Into the Black Tower

13: I want my Mummy!

14: Things that go Bump in the Daytime

15: What's in the Box, Dude?

16: The Tower of Power

17: March of the Killer Pigs

18: Let me Borrow Your Mind for a Minute

19: Return of the Psycobunny

20: Total Melt-Down

21: Robotnik Eggscapes

22: FrankenSonic Lives!

23: Over-the-Top Deranged Mayhem and Madness!

24: All's well that ends well, dudes

Sonic the Hedgehog in other media
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