Later on, the protagonist, Billy, witnesses the mermaid about to be stolen by thieves. He responds by charging headfirst at the thugs, hoping to distract them long enough for her to escape. Granted, it backfires, but this still takes a lot of courage. They're much older and stronger, and he shows no fear whatsoever.
In Attack of the Mutant when Skipper defeats the Masked Mutant by tricking him into turning into acid - the Mutant could turn into anything solid, but if he turned into a liquid he would be locked in that form.
The villain himself gets one with[[his entire plan to capture Skipper. To elaborate, the Mutant takes the form of a young girl named Libby to get close to the kid, while his henchman(disguised as him) has captured a super hero. When Skipper finds out, he comes back to the lair, where "Libby" kills the villain, saving his life...before revealing herself as the mutant, explaining the ruse, then moving in for the kill. Up until then,very few villains in the series had displayed this much ruthlessness and cunning.]]
In "Calling All Creeps", Ricky is forced to put transformation seeds into a batch of chocolate chip cookies so the Creeps (a group of lizard aliens who first met Ricky over the phone) can turn all the kids into one of them. Ricky tries to stop this from happening, but, upon learning that anyone who eats the transformation-seeded cookies will become mindless slaves to Ricky and the Creeps, Ricky (who's been the school Butt Monkey through most of the book) decides to give cookies to everyone, with the knowledge that those who tormented him before will be brainwashed into following his orders. A revenge fantasy (that doesn't involve guns) for the bullied and oppressed at school if there ever was one.
In Go Eat Worms! when Todd pays his sister back for playing a trick on him by sabotaging her science fair project, a giant paper mache robin, by stuffing worms in the beak.
In "Don't Wake Mummy", Jeff single-handedly got rid of the mummy.
"Goosebumps Horrorland: Creep from the Deep", has Billy Deep swimming to the island shore with a busted knee, whacking a zombie pirate in the ribcage with his cane, fending off a snake, and finally taking down the pirate captain. Turns out the cane he was carrying was actually the captain's leg, and he wants it back. Billy's response? He utilizes the spear fishing lessons his uncle taught him earlier, and sends the leg flying into the bastard's chest.
"How I Learned to Fly": Jack and Wilson are scheduled to race each other live on TV, and Jack loses his powers, while Wilson wins again. The awesome part comes when it's revealed that Jack faked losing his ability to fly, so he can go back to being a more-or-less ordinary kid and be with the girl he's had a crush on for a long time, while Wilson is forced to move because he's still trapped being a celebrity