During a meeting with Batman and Robin at his Fortress of Solitude, Superman gets the idea to load his Univac Computer with everything he knows about Krypton and ask it to computer what would have happened if Krypton never exploded. The machine came up with an alternate history in which Jor-El and Lara had a second son named Zal-El. Unfortunately, this imaginary brother to Kal-El would die tragically with Jor-El and Lara when a rocket they are flying in space crashed landed on a magnetic meteor and exploded. A monument to the dead family was later built by Futuro, a super-powered being who befriended Kal-El.

  • In Absolute Crisis on Infinite Earths (2006), it was revealed that the computer simulation was relating events that actually happened in an alternate universe -- Earth-132. So Zal-El did actually exist in that universe.
  • This version of Zal-El (Earth-132), including all history and corresponding appearances, was initially erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. However the ending of Convergence retroactively prevented that collapse, saving all the alternate realities, though in an "evolved" form. Even though versions of the character may have since appeared, this information does not apply to those versions.