This actually needs two command blocks.
Achtung: Minifiziere den Command um Probleme zu vermeiden :)
Astroman
walcom hom jimmy
NEW AND IMPROVED LITTLE PUFF!!! (Little Puff 2.0)
Bill the Purple Man
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)