# Dragon Ball Z, Vol. 21
## Part I: The Androids' Arrival
- Introduction to the Android Threat
- Overview of the Androids' origins
- Trunks' warning about future dangers
- The Z Fighters prepare for battle
- The Search for the Androids
- Goku and his friends split up to locate the Androids
- Tension builds as the Androids remain elusive
- Encounters with false leads and distractions
- First Confrontation with Androids
- The Androids reveal themselves
- Initial skirmishes and assessment of their powers
- Goku's illness complicates the situation
## Part II: The Rise of Cell
- Emergence of a New Threat
- Introduction to Cell, the ultimate bio-android
- Cell's mission to absorb Androids 17 and 18
- The Z Fighters realize the gravity of the new threat
- Cell's Path of Destruction
- Cell's rampage across cities and towns
- Efforts by the Z Fighters to stop Cell's advance
- Piccolo's decision to fuse with Kami for greater power
- Training for the Upcoming Battle
- Goku and Gohan train in the Hyperbolic Time Chamber
- Vegeta and Trunks undergo intense training
- Other Z Fighters prepare in their own ways
## Part III: Preparations and Strategy
- Building Alliances
- Temporary truces among former rivals
- Coordination between human forces and the Z Fighters
- Planning strategies to defeat both the Androids and Cell
- Power-Ups and Transformations
- Unlocking new levels of Super Saiyan power
- Discovering hidden potential through rigorous training
- Key moments of character development and growth
- Anticipation of the Cell Games
- Announcement of the Cell Games tournament
- Speculation on who will participate and succeed
- Final preparations before the climactic showdown
## Part IV: Reflections and Foreshadowing
- Themes of Sacrifice and Responsibility
- Characters grappling with personal sacrifices
- The burden of protecting Earth from extinction
- Moral dilemmas faced by heroes and villains alike
- Hints at Future Conflicts
- Unanswered questions about Cell's true nature
- Potential betrayals or unexpected alliances
- Teasing events that will unfold in subsequent volumes
- Character Development Arcs
- Goku's role as a mentor and leader
- Gohan's emergence as a central figure in the fight
- Supporting characters finding their place in the battle