Shadow Dragons of Time Conflict

The Shadow Dragons of Time Conflict was a minor conflict that interrupted the Demon Realm Assault.

Prelude
Android 9, Cell-X, and the Dark Empire made several wishes to Dark Shenron including selfish wishes and released the Spirits of the Dark Dragon Balls; sending the Shadow Dragons of Time to seven different periods in history.

Conflict
The conflict began with Sky Dark Shenron assaulting Goku, Vegeta and Frieza from Age 779 and was able to overpower all three of them with ease. Frieza is killed by Goku after Whis reversed time allowing them to focus on Sky.