Cass Brennan was a top member of Marc Spector's legal staff at Spectorcorp. He was also "Shark", agent of Moon Knight's network of informants known as the Shadow Cabinet, and unaware he was working for the same man in both capacities.
- Cass Brennan and Shark appeared independently of each other before it was confirmed they were the same man in Marc Spector: Moon Knight #56.
- 5 appearance(s) of Cass Brennan (Earth-616)
- 1 mention(s) of Cass Brennan (Earth-616)
- 1 image(s) of Cass Brennan (Earth-616)