Elroy Jetson is age 6 and a half (self-reported in the first episode), is the younger of the two children in theJetson family. He is highly intelligent and an expert in all space sciences. Elroy attends Little Dipper School where he studies space history, astrophysics and star geometry. He has (so far) appeared in two sketches.
In this skit, his father is murdered by an unknown murderer. He is first seen on a photo together with his family, and he is later seen when the victim's family is interviewed. In his short interview, he claims that "it isn't so bad, because he has a new dad and everything". The new dad quickly turns out to be none other than Mr. Spacely who sends Elroy to bed and threatens to neuter Astro when he questions what Spacely does with Jane.
Elroy was voiced by Donald Faison who also voiced Del Spooner (aka Will Smith) in the same skit.
In this skit, Elroy brings home an alien egg (from the movie Alien) after going to a field trip, and later releases a Facehugger from it, which he names Ranger (thanks to the fact that Astro said danger to warn him, but accidentally mispronounced it as Ranger). The next morning, Elroy tells the rest of the family that Ranger slept on his face all night, and that he was dead when he woke up. Later, Elroy is killed when a chestburster gushes out of his body. This time, he was voiced by Seth Green.