Jethros are speech-wise only capable of saying the phrase, "I am Jethro!" They do have the ability to express emotion, however their range of emotion is much smaller than that of their siblings, primarily due to their small range of speech.

In the episode "Stop attacking the Plaza", Jethro showed to be very energetic and wild at the family dinner, by climbing all over the walls and ceiling. 

Using its treads, Jethro will keep rolling until it hits something. The direction they move in is controlled by a switch located inside their head compartments. 

Mega Jethro however is a massive form of Jethro shown in the episode, "Jethro's All Yours". It is shown to be incredibly durable, as it was not dented by a punch from Radicles. To defeat the Mega Jethro, K.O. and Rad had to climb through a port entrance located in the robot's eye and pull a lever inside its head to reverse its movement. 

Level: -1 

Original VA: Dave Herman