Lost Signs

When the Defenders battled the Zodiac, not all twelve signs were there. Leading the cadre was Scorpio, brother of S.H.I.E.L.D. agent Nick Fury. The rest of the Zodiac were Life Model Decoys that Scorpio designed using S.H.I.E.L.D. technology. But activating these androids prematurely caused three of them to malfunction: Capricorn, Pisces and Virgo. I am uncertain of the astrological implications of losing these particular signs, but Scorpio had designated Virgo—the only female in the group—as his love interest. The heartbroken criminal killed himself (Defenders #50).

Two of the androids, Sagittarius and Libra, would return to lead other supervillains pretending to be Defenders for a Day.

This image of Scorpio (Jake Fury) comes from Defenders #50.

What's Up, Doc?

The title Doctor can be confusing in comic books. Whereas Dr. Strange and Dr. Druid both earned medical degrees (Strange was a surgeon and Druid a psychiatrist), that wasn't a given. In the case of Dr. Spectrum of the Squadron Supreme, the hero's alter ego Joseph Ledger was an astronaut with no suggestion that he held the title Doctor out of costume.

In contrast, the Squadron's enemies in the Institute of Evil included Dr. Decibel (a physician). Additionally, the secret identity of Dr. Spectrum from the Squadron Sinister was Dr. Obatu (Iron Man #63), revealed slightly before his first battle against the non-team (Defenders #13-14).

Under the entry for the Squadron Supreme, the original edition of The Official Handbook of the Marvel Universe listed Dr. Spectrum's profession as teacher.