Heinlein's 1959 short story '—All You Zombies—'. The core premise is a closed time-travel paradox in which one individual (Jane/John/Agent/Fizzle Bomber) exists across multiple timelines, with the intersex condition and resulting surgery enabling the self-conception loop. Sarah Snook portrays both the female Jane and post-transition male John versions of this single character, creating a prominent on-screen gender transition element central to the twist but drawn directly from the source material rather than added for contemporary messaging.

Themes center on identity, fate, predestination, trauma, and free will versus determinism, explored through the agent's missions and personal revelations, without critiques of patriarchy, systemic oppression, or identity politics as narrative drivers. Creator intent focused on mapping Heinlein's paradoxes and adding a thriller subplot while preserving the original's cynical tone; no statements emphasize activism or inclusion mandates. Reception highlights the clever plotting and performances with no notable 'woke' backlash or review-bombing tied to progressive ideology.

The gender portrayal is affirmative and unavoidable to the story but functions as sci-fi mechanism, not ideological statement, keeping progressive influence minor and incidental to the entertainment-focused time-travel narrative. Casting evidence: Casting research is incomplete or contains unresolved comparisons; overall casting fidelity has not been established. Documented credits include Sarah Snook as The Unmarried Mother / Jane / John; Ethan Hawke as The Bartender / Agent Doe. Reported casting findings: Sarah Snook as The Unmarried Mother / Jane / John: Cross-sex casting for male version of the character; faithful to source story's premise rather than modern swap The casting comparison for Ethan Hawke as The Bartender / Agent Doe remains unresolved.