| Issue | #173 |
| Published | February 1970 |
| Cover Price | 0.15 USD |
| Pages | 36 |
| Editing | Stan Lee |
| Notes | Inks credit from George Olshevsky's Index via Mark Elstob (GCD Error List 14 January 2005); the original indexer credited Bill Everett. |
| Characters | Thor; Ulik; Ringmaster and His Circus of Crime [Ringmaster [Maynard Tiboldt]; Princess Python; Clown] |
| Synopsis | Thor vs Ulik at the Circus of Crime. |
| Genre | Superhero |
| Pencils | Jack Kirby (signed) |
| Inks | John Verpoorten (signed) |
| Notes | Inks credit from George Olshevsky's Index via Mark Elstob (GCD Error List 14 January 2005); the original indexer credited Bill Everett. |
| Reprinted | in Essential Thor (Marvel, 2001 series) #4 [black & white] |
| Characters | Thor; Don Blake; Fake Thor (Mike) (I); Loki; Ulik; Ringmaster and His Circus of Crime [Ringmaster [Maynard Tiboldt]; Princess Python; Clown; Luigi and Ernesto Gambonno; Cannonball] |
| Genre | Superhero |
| Script | Stan Lee |
| Pencils | Jack Kirby |
| Inks | Bill Everett |
| Letters | Artie Simek |
| Notes | First appearance of the fake Thor (Mike). |
| Reprinted | in The Mighty Thor (Marvel UK, 1983 series) #2 (1983); in Essential Thor (Marvel, 2001 series) #4 [black & white] |