In the beginning of crossover, josh explains how he is doing in a game. He says what he is doing and also tells us his nickname... Filthy Mcnasty. Filthy (Josh) then tells us that at first he hated the nickname because people made fun of him.
JB starts to talk to the girl that he likes and they start to hang out together. However, josh thinks that it's all a bit strange but then shrugs it off and starts to think about basketball again.
This is when Josh and JB found out that his dad stopped basketball because he got very severely injured and didn't accept the operation to keep him playing. This made them both very upset.