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4 series tagged “portal” totalling 144 episodes
Night Sky
Cancelled
8 Episodes
TV-MA

Night Sky

2022
Popcorn81%
IMDb7.3
Primeval
Ended
36 Episodes
TV-14

Primeval

2007
Popcorn77%
IMDb7.2
Primeval: New World
Ended
13 Episodes
TV-14

Primeval: New World

2012
IMDb6.5
Sliders
Ended
87 Episodes
TV-PG

Sliders

1995
Popcorn74%
IMDb7.4