Justice League Unlimited

Visual: A book by Plato among Savage's collection
In Savage's bookshelf, we can see one book by Plato, one of the most influential classical Greek philosophers, which supports the idea of Savage's redemption -- he is now an intellectual, rather than a megalomaniac.

Bugs:
The big bugs/hive motif is pretty common in sci/fi, but these bugs strongly resemble the "infantry" Bug aliens of Starship Trooper (especially in the legs and gait). One might also draw comparisons between this ep and the anime Blue Gender where a cryo-tube guy wakes up to a giant bug infested earth.

Superman with a Hammer Superman wielding a hammer, wearing a beard, and having a red cape gives him more then a passing resemblance to Thor, the Norse god of Thunder and superhero over at Marvel Comics. Coincidentally or not, Avengers/JLA #3 came out the week before this episode aired, and the cover of Avengers/JLA #4 also has Superman wielding Thor's hammer.

Superman: On your feet, Mr. Wizard.
Referencing the popular cult TV show, first aired in 1951 and run on various U.S. and Canadian channels in various incarnations.

Spaceship:
Savage's spaceship project looks suspiciously like the spaceship and the launching pad as seen in the 1951 movie When Worlds Collide.

Story This episode seems to pay homage to Planet of the Apes with several similarities to that sci-fi classic: 1) The protagonist making his way across a desert to a jungle; 2) The protagonist follows a tracking signal to a downed spacecraft (more the remake); 3) the aspect of the protagonist time-travelling to the future without realizing right away that it is Earth until he sees a "ruin" from his time; 4) the evolution of lower creatures to the dominant species as a result of a nuclear cataclysm and 5) Superman resembling Charlton Heston as his hair grows, the injuries he sustains throughout his ordeal, and the makeshift clothing made from his tattered uniform.