- This page details Alexander Marcus in the primary universe; for the Alexander Marcus in the mirror universe see Alexander Marcus (mirror); for the Alexander Marcus in the alternate reality created by Nero's temporal incursion see Alexander Marcus (alternate reality); for the Alexander Marcus in all other alternate universes see Alexander Marcus (alternates).
| Alexander Marcus | |
| Species: | Human |
| Gender: | Male |
| Born: | Early 23rd century |
| Affiliation: | Federation |
| Family | |
| Marital Status: | Married |
| Spouse(s): | June Marcus |
| Children: | Carol Marcus |
| Other relatives: | David Marcus (grandson) |
| Career | |
Alexander Marcus was a male Human who was the father of Federation scientist Carol Marcus. Alexander was the grandfather of David Marcus.
- The primary universe's version of this character has never been seen or mentioned onscreen, but his existence is implied since the alternate reality created by Nero's temporal incursion only begins in 2233, when Marcus was already in adulthood.