He's always rushing off like that! Maybe the guy has to take a tranquilizer! 
Superman #257 is an issue of the series Superman (Volume 1) with a cover date of October, 1972.
Synopsis for "Superman Battles the War-Horn!"
An alien comes to Earth for the purpose of stealing its nitrogen, and wields a war-horn weapon that can even stagger Superman.
Appearing in "Superman Battles the War-Horn!"
Featured Characters:
Supporting Characters:
Antagonists:
- War-Horn (Single appearance)
Other Characters:
- Great Caesar (Mentioned only)
Locations:
Items:
Vehicles:
Synopsis for World of Krypton: "The Greatest Green Lantern of All!"
On the eve of the retirement of Tomar-Re, Green Lantern of Xudar, the Guardians of the Universe review the incident in his career that troubles him the most: the destruction of Krypton, a world in his space-sector. At the time, the Guardians had proposed making the Green Lantern Corps independent of themselves, and decided that the offspring of Jor-El and Lara of Krypton would be the best choice to lead the Corps, when he came of age. Since Krypton was diagnosed by them as about to explode, they assigned Tomar-Re to gather large quantities of the element stellarium to dampen down Krypton's uranium core. This was done rather than simply transporting the population of Krypton away, because the Guardians feared such a move would doom Kryptonian civilization. Later, Brainiac stole Kandor and Jor-El's space ark with it. Kal-El was born to Lara and Jor-El, and the scientist purposed to save his son from the planet's impending destruction. Tomar-Re tried once again to dampen Krypton's internal flames with more stellarium, but was temporarily blinded by a nova star and was delayed. He reached Krypton only minutes after Kal-El's rocket had been launched, and just at the time of the planet's explosion. The Guardians saved Tomar-Re, and later claimed to have guided Kal-El's rocket to Earth.
However, when they learned that Kal-El gained powers beyond even their imagining on Earth, they abandoned their plan to have him lead the Green Lantern Corps, and allowed him to operate alone as Superman. Now the Guardians tell Tomar-Re that he has performed his duties well, and may retire in peace.
Appearing in World of Krypton: "The Greatest Green Lantern of All!"
Featured Characters:
Supporting Characters:
Antagonists:
Other Characters:
- Science Council (Dies)
Locations:
- Sector 0
- Sector 2813
- Ariel (Destroyed)
- Krypton (Destroyed)
- Kandor
- Kryptonopolis (Destroyed)
- Xudar (Mentioned only)
Items:
- Central Power Battery of Oa
- Green Lantern Ring
- Stellarium (Single appearance)
Vehicles:
- Kryptonian Rocket
- Space-Ark
Notes
- "The Greatest Green Lantern of All!" is reprinted in: