Which series could you watch a 12 hour marathon of? (1 Viewer)

[Obner]

The Flash, Veronica Mars and maybe some Doogie Howser thrown in.

 

[Jeff*H]

I could easily escape to Hawaii for 12 hours during these cold winter months with a marathon of Hawaii Five-0 episodes.

 

[Gregory V]

Dark Shadows, The Avengers, The Twilight Zone, Green Acres

 

[Ockeghem]

The Outer Limits (1963-1965 series); Dark Shadows (1966-1971 series); and TOS.