Hated to trick Superman... But I couldn't let Dr. Lucas sacrifice himself! He means too much to his family... The universe...! As Batman, I've had a full life... In fact, two full lives when you're considering my Bruce Wayne identity! Well, it was fun-- And fury! 
- — Batman
World's Finest #234 is an issue of the series World's Finest (Volume 1) with a cover date of December, 1975.
Synopsis for "The Family that Fled the Earth"
A scientist and his family flee the Earth in a stolen space station, while Superman and Batman try to deal with an orbit wobble that threatens the Earth. On their space trip, the heroes learn that the space station has been attacked by a mysterious intruder from outer space and as they investigate the case, they learn that the intruder was an alien experiment that got out of control. Superman takes the scientist and his family back to Earth and then deals with the aliens, while Batman uses the space station to save Earth, but sacrificing his own life.
Superman convinces the aliens to use their experiment to save Earth and the Man of Steel saves Batman from a certain doom.
Appearing in "The Family that Fled the Earth"
Featured Characters:
Supporting Characters:
- Dr. Calvin Lucas (Single appearance)
Antagonists:
- Aliens
- Krakon (Single appearance; dies)
Other Characters:
- President Ford (Cameo)
- Helen (Single appearance)
- Jamie (Single appearance)
Locations:
Notes
- The story is told in three chapters
- Part 1 Goodbye to a Small Planet
- Part 2 The Frankenstein of Space
- Part 3 To Save a World
See Also