Doctor Spectrum
Billy Roberts
- Also known as
Appearances
- The Avengers #69 — 1969-10-00
- The Avengers #70 — 1969-11-00
- The Avengers #71 — 1969-12-00
- Giant-Size Defenders #3 — 1975-01-00
- Giant-Size Defenders #4 — 1975-04-00
- Giant-Size Defenders #5 — 1975-07-00
- The Avengers Annual #8 — 1979-01-00
- Marvel Super Action #30 — 1981-04-00
- Marvel Super Action #31 — 1981-05-00
- Marvel Super Action #32 — 1981-06-00
- Marvel Masterworks: The Defenders #2 — 2010-12-02
- Thor #7 — 2015-06-00
- Giant-Size Marvel Omnibus #[nn] — 2025-05-28