Man-Thing and The Spectre in: "The Desperation of Doctor Thirteen!"

I always wondered why Dr. Thirteen was such a skeptic in his back up comic stories.  I mean, he lived in the DC Universe, where super heroes and villains were quite common,  The Justice League alone included an Atlantean, an Amazon and three aliens!  I think my mind would have been a little more open to the unknown.

Man-Thing First met The Spectre in STF #1081...