The plot of "Dragon Ball Z: Battle of Gods" involves Lord Beerus, the God of Destruction, arriving on Earth. Goku and the other Z-Fighters have to stop Beerus from destroying the Earth.
"Dragon Ball Z: Battle of Gods" begins with Lord Beerus, God of Destruction, challenging Goku to a fight on King Kai's planet. Even though Goku powers up to Super Saiyan 3, Beerus defeats him in only two attacks. Seeking a stronger opponent, Beerus and his assistant, Whis, set off for Earth to challenge the other Z-Fighters. Beerus arrives on Earth, interrupting Bulma's birthday party. Bulma's husband, Vegeta, who has received word of Beerus from King Kai, stalls for time to keep Beerus entertained.
Things go awry when Beerus punches Bulma, which causes Vegeta to attack Beerus. Though Vegeta has become stronger than Goku in his rage, he is still easily defeated by Beerus. Goku soon returns and uses a newly discovered power to transform into a Super Saiyan God, a form much more powerful than Super Saiyan 3. Goku and Beerus engage in an extended fight, which ends with Goku reverting to his normal form due to exhaustion. However, Beerus acknowledges Goku's strength and thanks him for a challenging battle. The movie ends with Beerus and Whis leaving Earth.