It is Hero War I is going on, but then, all super-heroes give up when Emperor Darkforce destroys where the superheroes live. Now, Hero War II begins when the Mighty Squad of Super-Heroes arrive. Note: Whiskerers and The Emperor's Apprentice (called shortly Apprentice) was voiced by Tom Kenny due to Jeff Bennett only voicing Kicker, and Richard Horvitz wasn't hired to voiced Apprentice yet. When the pilot was shown to Nickelodeon, they decided to not let Tom Kenny voiced the Apprentice and Whiskerers. Tom Kenny continued to voiced Man-tel, but for the series, him voicing Whiskerers was replaced by Jeff Bennett, and him voicing the Apprentice was replaced by Richard Horvitz.