Issue 24
Superboy and the Legion of Super-Heroes (1977-) #254
Brainiac 5 enlists the Legion of Substitute Heroes for assistance against the Super-Assassins.
Creators

From
Superboy and the Legion of Super-Heroes (1977-) Series
Brainiac 5 enlists the Legion of Substitute Heroes for assistance against the Super-Assassins.

From
Superboy and the Legion of Super-Heroes (1977-) Series