Rating: ★★★★★Previously on Dragon Ball Z
(I) Dr. Gero created androids who will kill Goku and the gang leading the world into chaos.
(II) Trunks who is the son of Vegeta and Bulma come from the future and help Goku in order to guarantee a better future.
(III) The gang has arrived prepared to fight and are trying to find the androids and unfortunately since they are not humans, they do not have chi to detect for Goku and everyone else.
That is what you missed on Dragon Ball Z!
In this volume we witness the androids in action and they are programmed to be deadly and almost killed Yamcha. I was so close to being outraged for these deaths have become insignificant because somehow Akira Toriyama brings them back to life so if they are going to die then it needs to be final. Luckily Yamcha survived and gave the audience a clue how these androids are powerful. They have this chi sucking ability in their hands so if they touch you or you send them a chi power they will absorbed it and receive maximum power.
Goku heads a major battle and it is pretty clear something is wrong based on his breathing and how he is using full power early on in the fight and then I realize that the virus that killed Goku has arrived and he needs to take the cure that Trunks provided to him three years ago. Vegeta steps in and beats the living day out of the androids and leaves Dr. Gero the only person left to fight since he converted himself into an android.
Dr. Gero quickly realizes that he is no match for Vegeta so he needs to speed up to his laboratory in order to awaken androids #17 and #18. Trunks shows up again to witness and see if Goku and the gang has destroy the androids and he is utterly shocked that android #19-20 are not the famous androids to wreak havoc on planet Earth and realizes that his presence has changed the outcome of the future and makes the connection that #17-18 are the ones that are deadly since they have infinite power source.
Vegeta and the rest are quickly trying to reach the laboratory in order to prevent Dr. Gero from awakening them and sadly they got just a tad late and the androids are awake. Now doom has arrived on Earth and now Goku and the gang's life hang in the balance with the arrival of these evil robots. Stay tuned until next time on Dragon Ball Z...