Here`s one of my special long posts.
Goku can survive on the sun. He`s taken planet crushing hits before. Broly was just SS 1 and destroyed countless galaxies. Goku can do the same at SS 2. Goku`s reflexes are supberb. Theres no way he`d die against Doomsday. Let me go show you an episode of DBZ. (Cell games.) At speeds Doomsday can`t see, he can`t grasp him. And lets not forget about the blinding Solar Flare technique. After blinding Doomsday, he`ll open the rift and trap him there forever. Goku doesn`t need Kryptonite. I never said he`d use it anyway. Fights aren`t all about power and speed. They`re about skill and strategy. (Which Goku has in every stat.) And since Goku`s been in countless fights, he has a tonne of experience. Super Saiyan 1 Goku has been compared to Super Man. Not anything higher. Goku even killed Broly. (Twice.) Majin Buu and other forms were said to be invincible/immortal, and they`ve died. (Except Majin Buu. He became a good guy.)
Gods are immortal. They can only be killed by other gods or legendary things. (Perseus.) Goku is the Legendary Super Saiyan.
Since Goku surpasses them in every category except regeneration and nullification, he`ll just beat them the first time, open a rift to the HTC, and throw them in there. When they revive, they`ll have no one to fight but each other. (Since Goku throws both of them in there, Doomsday can only fight that other guy, while Goku leaves.) They`ll be there forever. Remember, when a Saiyan is in danger, or escapes death barely, they`re powerlevel rises tremendously. Cell had Saiyan cells, because he was made up of the Z fighters DNA. When he was about to use Kamikaze to blow up the Earth, Goku teleported them to King Kai's planet. But a sincle cell survived on Earth, and Cell regenerated and had an even stronger powerlevel. So when a Saiyans health go`s down, their strength, speed, abilities/techniques, and reflexes go up tremendously.
Here`s the DBZ episode.
http://dbze164.blogspot.com/
Your also forgetting that Goku can use Multiform, and the Afterimage Technique. Multiform- Creates duplicates of you, but divides your powerlevel. Afterimage Technique- There are several afterimages that appear, most being just the image after you travel really fast. So Doomsday and that other guy will have to figure out which ones real, have to deal with 4 Goku`s, (Or more) and will be blinded by Solar Flare. He can also combine Multiform and the Afterimage Technique to create 4 real Goku's (or more) and have them use the Afterimage Technique. OR use multiform, and have them all use Solar Flare to blind Doomsday and that other guy.
As you can see in the episode, he can also charge up the Kamehameha wave and use the Instant Transmission to warp and shoot.
I have backed up my statements thouroughly. You can`t say Goku won`t have the opprotunity to create the rift and trap them there. Think thats cheap? Goku could also have the King Kais to seal them away like they did to Bojack. Goku's goal is to beat his opponents. Not kill them. Or Goku will just use the Instant Transmission to teleport them into a black hole. Goku can over power it's gravitational pull at SS4. Lets just say he can`t. Then he would open the a rift, go in it via Instant Transmission, and let the rift close, and open another one that will take him back to Earth or away from the black hole, and use Instant Transmission to warp back to Earth. I`m sure he can beat a black holes gravity of course, but since there is no proof that I know of for this, I backed up how he could get out by using a different method. He could also turn SS 4 and disturb it`s gravitational force.
I may have some spelling mistakes due to this post being ridiculously long. Also, to make sure they don`t follow him back out of the rift, he`ll blind them, teleport far away, and leave. The rift stays open for about 10-20 seconds only, before it corrects the fluctuation in the fabric of time and space.