Episode 2 has a lovely flashback of the Superman of Irons' resident Earth (who is in a black suit) mercilessly incinerating several of Irons' fellow soldiers, including his version of Sam.
Episode 3 ends with Leslie Larr using her heat vision to kill a Mook for failing to kill Sharon Powell.
Episode 6 has Superman almost lose his temper after a bunch of soldiers shoot him with kryptonite projectiles. His eyes glow red, and he speeds right into a soldier's face, stopping inches between them and telling him to stand down. Clark later admits he had to fight to keep his temper reeled in and that his anger was truly tested.
In Episode 7, Irons has a flashback of his city being destroyed by his Earth's Superman. And Superman is leading an army of black-clad mooks.
Also in Episode 7, Jordan overhears Irons (with his superhearing) planning to kill Superman and tells Jon that someone is about to kill their dad. Despite not knowing how to drive yet, a desperate Jon speeds off in their dad's truck, pleading with Jordan to focus enough with his superhearing to find out where their dad is to save him. By the time they get to him, Irons is literally one swing away from decapitating Clark and they narrowly save him from certain death.
In Episode 8, Clark finding out that, in Irons' world, he murdered both Lois and Sam. It's not just learning he's a cold-blooded killer in this world, which is already enough to break his heart. His victims in this world are people he personally knows and loves as his dear family. And, in this world, he straight-up murdered them without hesitation. He takes a minute to back away by himself as he takes in this horrible information, shocked upon learning his worst nightmare of using his powers for evil actually came true. Even in an alternate world and version of himself.
Season 2
Anderson reveals that he's been training the teenagers who were affected by X-Kryptonite to be, essentially, America's personal Supermen.
The ending of Episode 1 has a familiar smashing as it focuses from Smallville to a construction site down, then down below as a spiky hand busts through a wall and clutches at a nearby rock. Doomsday is Coming and even the Superman & Lois logo shudders as he continues his escape.
Doomsday's terror continues in Episode 2 and he makes his way through the mines. Though all we see of him is just a silhouette and four glowing lights on his shoulders and hands, his ferocity is shown as he pulls away two miners to certain death and forces the third to detonate the explosives in the cave, dropping it on him.
Episode 3 shows that that's not Doomsday - that's Bizarro! Despite that, the beast is ridiculously overpowered, easily shrugging off machine-gun fire and Steel's red sun cannon. The only thing that saves Superman from being beaten to death is the two of them suffering from the visions again.
Clark's Bizarro-fueled outbursts at his sons are terrifying. One minute, he's the Nice Guy everyone knows Clark Kent to be. Then the next, he's displaying glowingred eyes as he rages at Jordan and later Jonathan in a distorted voice.
In "The Inverse Method," Ally Allston proves to be a Manipulative Bitch good enough to put Zeta-Rho in the shade. We see the effects of her brainwashing with Lucy Lane, and it's horrifying. She makes Lucy, who nearly killed herself thanks to Ally's instructions, believe that it was somehow a good thing.
At the conclusion of Ally's conversation with Lois, she gets up to leave... and a handful of other patrons in the diner follow suit. Which begs a disturbing question: how many Smallville citizens are under Ally's sway?
Also in "The Inverse Method," Anderson discovers the location of the creature that escaped from the mines and, unaware that the creature in question is Bizarro, immediately sends three of the X-Kryptonite enhanced teenagers after it. Things do not go well for them as Bizarro effortlessly murders two of them with his bare hands while Clark (and by extension, the audience) are forced to watch it happen from Bizarro's own POV via one of Clark's visions. Tag only survives thanks to Superman's timely arrival on the scene, but is seen in the next episode to have some badly-broken ribs.
In "Girl... You'll Be A Woman Soon", we see Lois confront Bizzaro in Kitty Faulkner's office, only for the monster to fly off. When Lois investigates further, we see that Faulkner's neck has also been snapped by the beast, her head wrenched a full 90 degrees with a look of abject horror on her face. While certainly a Hoist by Her Own Petard moment, it's also equally horrifying.
Season 3
Lex Luthor shows up at the Kent's house and implicitly threatens Lois and her family if she doesn't retire (which, of course, she's not going to do). Given that Jordan's been showing off recently, this cannot be good...
Lex and his minion investigate the tunnels where Bruno had his project. Bizarro is seen feeding off of rats, and attacks them, with the implication that he's going to kill (and eat) Lex's minion too.
