Timeline 4: Unseen
Little information is given about this timeline, This timeline can be seen as the first "version" of timeline 1. (There was only one time dimensional/traveler which was Trunks from timeline 3 who interfered), while Cell from another timeline never came.
Frieza and King Cold, invade Earth to get revenge on Goku. They are killed by Future Trunks3 who appears from the future. Future Trunks3 meets Goku when he arrives on the planet and gives him the heart medicine; he also warns the Z Fighters about the Red Ribbon Androids who will arrive in three years, before returning to his future.
Dr. Gero (aka Android 20) and Android 19 battle the Z Fighters. Goku, who did not take Trunks' medicine/antidote, becomes sick during his fight with Android 19. Vegeta arrives and takes over, destroying 19, and Goku is taken home and given his medicine. Dr. Gero flees.
Future Trunks3 arrives back to this timeline and finds the destroyed Android 19, a robot he is never seen before. He begins to realize that this timeline is starting to branch off considerably from his.
Dr. Gero escapes back to his lab and awakens Androids 17 and 18, who then proceed to kill him. They go on to activate Android 16.
The Z Fighters are defeated by 17 and 18, but none are killed.
The Z Fighters find the blueprints of the androids and use it to create a remote control, allowing them to deactivate the androids in this timeline. No version of Cell is seen or known in this timeline and the threat of the androids is over
Future Trunks3 leaves back to timeline 3 to deactivate the future androids.