"King of Mars" is the 56th episode of The Adventures of Jimmy Neutron: Boy Genius.
Eustace decides to travel to Mars and collect it's energy source, but Team Neutron is not going to let it happen, so they race to Mars and try to get the source before he does. They reach the source, but some Martians won't let it happen and decide to destroy the Earth.
- For some reason, this episode has never aired on the NickToons network.
- Jimmy admits he thinks that Cindy is pretty and smart, which he denies at the end of the episode.
- Libby complaining that Cindy and Jimmy should "get a lab" is a reference to the well-known phrase "get a room".
- When on Mars, Sheen sings a song about a martian named Ringo. This is a possible nod to Ringo Starr, former drummer of the Beatles.
- Cindy helps the villain again, as she did in "The Eggpire Strikes Back".
- This episode takes place before "The League of Villains" even though it was aired after that episode.