The Loop (TV)
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- Jason Ralph as Quentin Coldwater
- Stella Maeve as Julia Wicker and Nameless' Sister
- Olivia Taylor Dudley as Alice Quinn
- Hale Appleman as Eliot Waugh and Nameless
- Arjun Gupta as Penny Adiyodi/Timeline 23 and Penny 40
- Summer Bishil as Margo Hanson
- Rick Worthy as Henry Fogg
- Jade Tailor as Kady Orloff-Diaz
- Brittany Curran as Fen
- Trevor Einhorn as Josh Hoberman
- David Call as Pete
- Keegan Connor Tracy as Professor Lipson
- Mageina Tovah as Zelda Schiff
- Matt Frewer as Binder
- Brian Markinson as Everett Rowe
- Adam Bartley as Golf
- Sam Daly as Harcourt Caan
- Camryn Manheim as Sheila Cozener
- Lee Shan Gibson as Fillorian Farmer
- Ice Axes
- Resonant Singularity Scroll
- Underworld Metro Card
- This is the second episode from Season 4 to conclude with the National Suicide Prevention hotline. The first was "A Flock of Lost Birds".
- Jason Ralph makes his final appearance as a series regular. Following the airing, the showrunners confirmed that he will not return for Season 5.
- "The Seam" was the episode's original title.
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