Challengers of the Unknown / Issue #18
- Issue: 18
- Grade: VGF
- Publisher: DC
- Genre: Superhero
- Status: In Stock
- FC #: 1001151
March 1961 Intro. Cosmo the Challengers Spacepet Bob Brown cover & art See photos
March 1961 Intro. Cosmo the Challengers Spacepet Bob Brown cover & art See photos