Although the episode "Return of the Nanobots" was not as developed as it could have been, it was great to see the Nanobots again. Voiced by Daran Norris (Cosmo, from The Fairly OddParents) and Tom Kenny (SpongeBob SquarePants), the Nanobots, who first appeared in "Safety First", set out to wreak havoc on the world in order to get the attention of their "Great Creator", Jimmy Neutron. Even though this episode had many down points and is surely one of the more disappointing episodes of the show to this point, it is one of the better Hugh Neutron episodes, especially with his "Hugh Time", when he does the things he's always wanted to do, but has never had the chance to because the people of Retroville would never let him. However, many of the characters viewers have grown to love did not even have significant roles at all. Overall, "Return of the Nanobots" has a decent plot, but it is not an incredibly well-written or well-shaped episode.
*** Not a necessity