Mark Logan was the father of Beast Boy. He was a doctor on a jungle expedition when his son Garfield contracted a rare disease called Sakutia. Using an untested serum to heal his child, he accidentally gave him the super-power to transform into any animal. Eventually he and his wife die in a boating accident. Garfield Logan would go on to become a super-hero as part of the Doom Patrol, Teen Titans and Ravagers.
- Although this character was originally introduced during DC's Earth-One era of publication, their existence following the events of the 1985–86 limited series Crisis on Infinite Earths remains intact. However, some elements of the character's Pre-Crisis history may have been altered or removed for Post-Crisis New Earth continuity, and should be considered apocryphal.
- 11 Appearances of Mark Logan (New Earth)
- 3 Images featuring Mark Logan (New Earth)
- Quotations by or about Mark Logan (New Earth)
- Character Gallery: Mark Logan (New Earth)