Earth is finally peaceful again, but this calm is short-lived. The remnants of Frieza's army, led by Sorbet and his right hand Tagoma, arrive on Earth in order to summon Shen Long with the goal of resurrecting their old master. To do so, they threaten Emperor Pilaf, Shuu, and Mai for the Dragon Balls in their possession.

Once successfully revived, Frieza—who had been stoking his hatred for Gokuu Son and Future Trunks in Hell—proclaims that he will not be content until they are dead by his hand. Sorbet informs him that Future Trunks has not been heard of in years, and Gokuu's power has far surpassed even that of the mighty Majin Buu. Unfazed, Frieza responds that he only requires a few months of training before being capable of defeating Gokuu.

Will Frieza be able to exact revenge upon his nemesis, or will Gokuu, Vegeta, and their friends prevail against adversity, saving Earth once more?

[Written by MAL Rewrite]

It has been thirteen years since the Androids began their killing rampage and Son Gohan is the only person fighting back. He takes Bulma's son Trunks as a student and even gives his own life to save Trunks's. Now Trunks must figure out a way to change this apocalyptic future. (Source: ANN)

Nobita Nobi is an elementary student who hates studying, is bad at sports, and does everything half-heartedly. He is a pushover, unlucky, and fearful of many things. His personality makes him a failure in life, even affecting his progeny. This causes his great-great-grandchild, Sewashi, to take control of the situation. Sewashi travels back in time from the 22nd century to the 20th century to meet Nobita, who is shocked to see him appear out of his drawer alongside a blue robotic cat. The robotic cat calls himself Doraemon, who claims to have been pressured by Sewashi to assist Nobita, with their ultimate goal being to provide Nobita happiness. Frustrated after seeing Nobita's hopeless state, Doraemon decides to go back to the future. However, Sewashi activates a program within Doraemon that prevents him from doing so. Forced to stay, Doraemon helps Nobita using futuristic gadgets through his four-dimensional pocket—a bag containing anything inside it. Can Doraemon bring Nobita happiness and return to the future? [Written by MAL Rewrite]

Following a cataclysmic nuclear war, the world teeters on the brink of complete destruction. Civilization is polarized into a degenerate society where opposing packs of marauding scavengers prey on helpless, homeless nomads. For those who are lucky enough to survive the constant brutality and danger, it is a bleak existence. Life an death blur into abstractions. The only hope left for mankind is to find a hero worthy of becoming the next "Fist of the North Star" - an enlightened warrior - who is capable of leading those with the will to survive out of this barrenness into a new world. But in this savage no-man's land of shifting loyalties and power-hungry demi-gods, heroes are in short supply. 

(Source: AniDB)