When he realizes the Praetor means to end him, he'll call up some of that training that Mongul Jr gave him (I just remember he trained with him, not what it consisted of) along with everything Batman and Wonder Woman taught him with that super-mind of his, find Goku, crush his skull and use his corpse to bludgeon Gladiator to death.
Though in lieu of Goku's corpse, his own fists would work as well.
Besides, Clark has a woman to go home to! Leave her at the tender mercies of Gladiator, my ass!
(dang, still behind horrorwolf)