Howard Silk is a lowly cog in a bureaucratic UN agency who is turning the last corner of a life filled with regret when he discovers the agency he works for is guarding a secret: a crossing to a parallel dimension.

• J.K. Simmons
• Nazanin Boniadi
• Harry Lloyd
• Olivia Williams
• Sara Serraiocco
• Nicholas Pinnock
• Betty Gabriel
• James Cromwell