After the banished General Slade is found on earth, Clark realizes the Phantom Zone portal must be open and decides to go close it, however dangerous as his super powers don't work there. Oliver was denied coming along but managed by surprise. The heroes find the zone under the rule of General Zod, who looks forward to his revenge for both worlds on Clark and was promised full dominion by Darkseid if he eliminates the great Kryponian adversary. So Clark is forced to enter Zod's arena's mortal gladiator combat, while Oliver is offered an alternative and reminded of being Omega-branded already, which no earthling knows yet. In the Watch Tower, Lois discovers the three hours portal destruction 'safeguard' Clark ordered Tess to trigger and fights it.
Did You Know?
Near the end you see Clark rip off his shirt and buttons fly off when he does, this would be the first time in the entire history of Superman in all genres that buttons fly off his shirt when he rips it open to reveal his uniform underneath. See more
If I'd known about the long drop in, I would have brought some rappelling equipment.
If I'd have known you'd ignore my warning to come here, I would have told you to bring it! I know what I'm doing! You should have trusted me.
You should have more faith in your friends, Clark. I came here to help you. Wherever the hell this is.
References The Wizard of Oz