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.