The title has a dual meaning in that i believe it was about two sons trying to "prove" themselves to their fathers, Kalibak trying to prove his strength to his father, and Clark/Superman trying to prove to his father that the big city hadnt changed him.
The dynamic between Kalibak's need for approval and Clark's is played beautiful against the backdrop of their fight in Metropolis. Toss in the fact the Pa Kent gets involved/hurt and you have a explosive confrontation. The only thing missing is that Clark seems alittle distant until he parents are directly affected by the attack. Not sure about any of you but my 1st move would be to get them out of harm's way 1st no matter what the "superhero handbook" says.
Speaking of the Kents, it was great to see Ma and Pa get some much needed "star time". It was so fun to see how they reacted to the atmosphere in Metropolis and to Lois. I always thought they were underused in this series as it related to reaffirming who "Superman/Clark Kent" really is or why he does what he does. This episode established one thing i always thought though, they're his connection to the human race, not Lois. Although he may love Ms. Lane to death, it's ultimately his adoptive parents that have instilled in him the qualities necessary to be the Man of Steel.
They were a few lines of dialogue in here that were noteworthy, most of which came from Kalibak (voice brillantly by Michael Dorn), but nothing stood out about the rest. A special episode only in that it show us a little more about the Kents and how they feel about their little "Clarkie" flying around saving the day.