List of first appearances/Preboot

Lists of the first appearances of recurring characters, equipment and Legion-related concepts in the Preboot family of eras. Planets and settings can be found listed separately at List of worlds/Pre-Crisis.

Legionnaires

• Cosmic Boy - Adventure Comics #247, April 1958
• Lightning Lad
  • As Lightning Boy - Adventure Comics #247, April 1958
  • As Lightning Lad - Adventure Comics #267, December 1959
• Saturn Girl - Adventure Comics #247, April 1958
• Superboy (Kal-El)
  • As Superman - Action Comics v1 #1, June 1938
  • As Superboy - More Fun Comics #101, January/February 1945
  • As a Legionnaire - Adventure Comics #247, April 1958

Groups

• The Legion of Super-Heroes - Adventure Comics #247, April 1958

Equipment

• Time bubble - Adventure Comics #247, April 1958