The episode begins at Mount Pao's, also known as Chi Chi's house. We see that Chi Chi and Gohan's houses are right next door to each other. Pan wonders where Trunks is, and when he finally arrives, she runs to the door. Trunks are beat up and say it was Android 17.
As everyone runs to the door, they see a strange hole in the sky. Goku senses something evil from it, and then he's contacted by King Kai. King Kai now has a new planet, but he's still dead. He informs Goku that Earth and HFIL have had some sort of warp whole bring the two of them together. Seeing the hole, the Z fighters get ready to fight while the people of the Earth wonder what it is.
Android 17 sits on a mountain and strange messages are coming into his head. They say that there are 2 of him separated by time and space, but soon they will be reunited.
In the other HFIL, we see another Android 17 that was built by Dr. Myuu and Dr. Gero. He's caused the rift to open, so some of the people claim it's the end of the world. King Furry tries to keep the people calm, but nobody wants to listen to him. They run from the cities instead. Android 17 meanwhile continues to grow more evil, and he says the Earth is in for a shock that it's never seen.
In HFIL, the two doctors celebrate their new union, and Dr. Gero says it has always been his plan to replace humanity with new cybernetic people. Dr. Gero says that a small probe he created in HFIL was able to slip through and attach to 17 allowing him to control the original 17. They also plan on setting Goku up with a few old friends.
Back at Chi Chi's place Trunks finally wakes up, but he gets bombarded by questions. He tells everyone that he was on his way to Goku's when 17 attacked him. He managed to save himself and the driver, but 17 left a message that Goku must go to HFIL or the Earth will be taken over by villains from HFIL.
Goku agrees to go to HFIL because every villain that the Saiyans ever beat was coming to Earth, and he agrees to go alone when he sees the Red Ribbon Army, the Androids, Rilldo, Frieza's minions, and many more attacking the Earth. He also wants to go to see if Cell and Frieza have managed to get any stronger. Pan wants to go with Goku, but Bulma manages to convince her otherwise.
Goten gets attacked by Babadi's henchmen. At first he easily wins, but when he's taken by surprise Trunks manages to come in and save him. Elsewhere Hercule is being chased by the Red Ribbon Army, but Pan comes along and beats them with one blow.
Goku arrives in HFIL and finds the prisoners all tied up. He's also greeted by Dr. Myuu and Dr. Gero. They have 17 attacks Goku, but when Goku proves to be stronger they rush through the portal and get Goku trapped in HFIL with Cell and Frieza, and Dr. Myuu and Dr. Gero mock Goku.
As the others see the hole disappear, they wonder how Goku will get home, but Hercule believes he will find some way of getting home. Can Goku manages to beat Cell and Frieza and find a way home, and what will the 2 doctors do now that they are free from HFIL? Find out on the next GT.