# Dragon Ball Z, Vol. 13
## Part I: The Saiyan Threat
- Arrival of the Saiyans
- Vegeta and Nappa land on Earth
- Goku's race revealed
- Tension among the Z Fighters
- Battle with the Saiyans Begins
- Yamcha, Tien, and Chiaotzu's fight against the Saibamen
- Sacrifices made by the Z Fighters
- Goku's delayed arrival due to training in space
- Power Levels and Strategies
- Use of Scouter devices by Saiyans
- Underestimation of Earth's warriors
- Piccolo's fusion with Kami to increase power
## Part II: The Fierce Battles
- Goku vs. Nappa
- Goku finally arrives at the battlefield
- Display of newfound strength from gravity training
- Defeat of Nappa by Goku
- Vegeta's Ruthlessness
- Vegeta kills Nappa for his failure
- Vegeta's arrogance and cruelty showcased
- Preparation for battle against Goku
- Teamwork Among Z Fighters
- Gohan and Krillin team up against Vegeta
- Use of clever tactics instead of brute force
- Assistance from Yajirobe with Senzu Beans
## Part III: Climactic Showdown
- Goku vs. Vegeta
- Intense one-on-one battle between two powerful Saiyans
- Transformation into Great Ape by Vegeta
- Strategic thinking to counter Vegeta’s transformations
- Desperation and Sacrifice
- Gohan’s hidden potential unleashed
- Spirit Bomb attempt led by Goku
- Critical injuries sustained by both sides
- Aftermath of the Battle
- Vegeta retreats after being defeated
- Foreshadowing of future threats (Frieza)
- Recovery and reflection among the Z Fighters