Marco trains for a red belt in karate. However, after visiting his sensei's home, he discovers his sensei lives with his mother and does not even have a red belt. Sensei explains that he never got to watch the instructional video for the red belt as the tape got jammed in his video player. Marco and sensei visit thrift shops and eventually come across a rare video store where they have to defeat the store owner to win the tape. Meanwhile, Star looks all over the house for a hammer in order to put up a new poster that she just obtained.
After having skirmished with a number of dangerous monsters, Star Butterfly arrives on Earth to live with the Diaz family. However, rather than living a normal life, Star continues on having to battle villains both throughout the universe and in their high school, although if only to protect her extremely powerful wand, an object which she is still confused with.