If nobody could see a giant octopus sitting in clear water, I feel like that’s the swim team’s problem, not Clark’s. A couple of days of these mostly harmless pranks is all the principal can stand, and he tells a devastated Kent family that he is expelling Clark. I feel like there should be some middle ground between “mild finger-wagging” and “permanent expulsion,” but I’ve never been a school principal, so what do I know? No sooner is Clark out the door than he learns via super-eavesdropping that several teachers have come down with MacGuffin’s disease, leaving the school short-staffed. Enter Superboy, who, of course, knows everything about everything and can take the unattended classes on fantabulous, educational adventures to the Arctic, outer space, and the seafloor. What must those permission slips have looked like? Why do you hate sea life, Clark! Lest you think that Clark got himself expelled so he could be a free substitute teacher, we quickly learn otherwise as the school’s vaccination day arrives. Naturally, Clark can’t get vaccinated (and presumably …