Dragon Ball Z, Vol. 26 by Akira Toriyama

[Viz] Sci-Fi martial arts action! After years of training and adventure, Goku has become Earth's ultimate warrior. And his son, Gohan, shows even greater promise. But the stakes are increasing as even deadlier enemies threaten the planet. DRAGON BALL Z is the ultimate science fiction-martial arts manga. The world's greatest heroes have fallen, absorbed by the ever more powerful Boo, who has slaughtered everyone on the planet. Only Goku remains alive to fight...but even his strength will not be enough, unless he uses the Fusion Earrings to permanently merge with another warrior! Who will he choose...and when the dust has cleared, who or what will he become? On earth, among the stars, and in Boo's body, the last battle rages! The final volume of Akira Toriyama's martial arts masterpiece Dragon Ball Z!