My Life as a Teenage Robot/Nightmare Fuel


 * At the beginning of the first episode, Tuck walks into  to retrieve the baseball. Much of the house looks dilapidated, with what looks like the remains of a robot leaking oil. This is never brought up again.
 * When Tuck envisions the Planet of the Bikers, there's a sudden art shift in the character design, giving it a more-than-creepy look. The fact that the evil bikers' designs are based on the work of Rob Zombie doesn't help much, either.
 * Although Tammy does not look horrifying initially, her monstrous mouth and tongue (a Shout-Out to Alien) can catch people off guard in "Ball in Chain". Also, there is the concept of being a slave in marriage; trying to get out of it involves the groom being eaten by the bride. It is said to be the tradition on the Space Bikers' planet.
 * Gigawatt is certainly creepy... mostly because he's one of the few villains that could effortlessly curbstomp Jenny time and time again.
 * When Vexus has her Villainous Breakdown.
 * Vexus's obsession with Jenny and her various disguises and evil plans.
 * The Exo-Skin.