Temporal Do-Over is a time manipulation technique used by Whis.
Whis has the ability to travel back in time up to three minutes in the past, allowing him to undo any events that occurred. As he is God of Destruction Beerus' attendant and teacher, Whis often uses this technique to undo damage caused by Beerus when he destroys something by mistake and/or does something stupid.
Whis mentions that in the past, Beerus woke up and sneezed blowing up two of his planet's Suns, forcing Whis to use his Temporal Do-Over to travel back in time and prevent it. After Frieza destroys the Earth, Whis uses this ability to undo the destruction of the Earth by Frieza, allowing Goku to kill Frieza with his Kamehameha, preventing him from destroying the Earth. Whis later uses this in the Future Trunks Saga to undo the death of Gowasu caused by Zamasu.
Whis states in Dragon Ball Super that he cannot reuse the technique for some time after he uses it. It is also revealed that this technique can disrupt and potentially erase the original time flow, as besides Future Trunks traveling back in time, this technique was the only factor responsible for any of the main timeline's events to be averted and has shown that several times in Dragon Ball Super.
Temporal Do-Over appears in Dragon Ball Heroes, the characters are above planet Earth's stage facing Golden Frieza. If the player manages to reach the third round, in Frieza's turn to attack he will revert to his Final Form and will launch his Death Ball directly to the planet, thus destroying it. Whis then will hit the ground with his staff twice and the time will regress to the moment before Frieza loses his Golden Form, and the battle will continue normally (for this special in-game cutscene to occur, one of the characters of the player must be Whis, otherwise Frieza will remain in his Golden Form during the whole battle).
In Dragon Ball Xenoverse 2, Towa hacks into the Time Nest's communication system and pretending to be Chronoa, tricks Beerus and Whis to leaving Earth during Frieza's revenge in order to prevent him from assisting Goku and the Z-Fighters with his Temporal Do-Over. As a result, Goku and his allies save by Whis in the original timeline are killed when the earth is destroyed along with Vegeta. Fortunately the Future Warrior is saved by Future Trunks at the last second and they return to the Time Nest. After explaining the situation, Chronoa convinces Beerus and Whis to return and rewind time so they can fix history, believing that it will lure out Towa. Whis, Beerus, and the Warrior return to Age 779 and Whis uses his Temporal Do-Over to allow the Future Warrior to travel back before the Earth is destroyed. The Future Warrior uses an energy wave to stop Frieza's attack forcing Frieza and Metal Cooler to take on their Supervillain forms, only to be defeated by Goku, Vegeta, and the Future Warrior.
In a parallel timeline featured in Parallel Quest 63: "Appetite for Destruction", Whis playfully uses Temporal Do-Over several times while Beerus and Whis are fighting the Future Warrior and SSJG Goku when the Future Warrior and Goku manage to cause Beerus a certain amount of damage. Whenever he does so, +1'00 is added to the mission timer (to represent time being rewound) and Beerus' health is restored (as all the damage he previously incurred is erased). Defeating Whis allows the Future Warrior to focus on Beerus and leads to Whis using Temporal Do-Over one last time to revive Beerus after he is defeated, causing Beerus to admonish Whis for using Temporal Do-Over with out asking permission first. Interestingly, Beerus is shown to possess some awareness that the technique has been used, especially if Whis uses it repeatedly. Beerus even retains some recollection of what has occur or been said before Whis had used the technique, as he is able to vaguely remember Whis criticizing him, despite Whis' attempts to convince him otherwise, though Whis drops the act and apologizes when Beerus admonishes him for using the technique without asking permission. Whis attributes Beerus' ability to detect its use to being an astute observer.
- Temporal Do-Over is one of two techniques used by Whis capable of traveling through time, the other being his Warp technique, which allows him and Beerus to travel from Age 778 to the Time Nest in Age 850 in Dragon Ball: Xenoverse.
- In Xenoverse 2, he uses his Warp technique to travel from Age 778 to Age 852 and again from Age 779 to Age 852 and then back to Age 779. He also uses it to help Goku travel to Age ??? to aid the Future Warrior in the final battle against Mira.
- It is revealed in Xenoverse 2 that Whis' Temporal Do-Over does apparently not violate the laws that govern time as Chronoa makes no objection to its use during the altered timeline of Frieza's revenge. Presumably this is due to his status as the Angel that serves the God of Destruction of the Seventh Universe.