Kaz and Hyde are friends but have different views of how to solve the current state of deterioration of the Underworld. Kaz believes they should take over to fix things while Hyde, a scientist, thinks he has a formula that will solve the problems.
The Formula & "Calling"
The Underworld is a vamp run nation, much like a country, where some areas are good and some are skanky, drug laden areas that only the worst types of vamps go. The degenerate vamps have developed new diseases, easily spread, that can render them useless and even kill them. Threatening their species.
"Break Free" Kaz vs Hyde
Kaz and Hyde discuss their views with the higher council. They each show their version of the Underworld, what's wrong and how to fix it. Hyde thinks they can co-habitate with his plan. Kaz sees war as the only answer.
"Don't Hold Back" Hyde to Nia
We digress to the backstory of the creation of the formula. Hyde has been collaborating with fellow scientist Nia. They are close to perfecting the formula that will give vamps proper nutrition and lessen the need for human blood. In song "Calling" he is trying to connect with her on a personal level while supporting her perseverance in research.
The song is the argument and conflict between the two of them. Kaz ignores the fact that the elders are going discuss and give a recommendation after there “session”. He plans the infiltration of his “army” to take over the Underworld and do what he thinks should be done. Hyde disagrees.
After an argument, Nia never wants to see Hyde again. He begs her to understand him, explains how he feels and wants her to tell him the truth and "Don't hold back" on him. He wants to make things right.