Fan Casting The Twilight Zone (1990s) 3x14 - Five Characters in Search of an Exit

A uniformed U.S. Army major wakes up to find himself trapped inside a large metal cylinder, where he meets a hobo, a ballet dancer, a bagpiper, and a clown. All of them theorize wildly regarding their presence here, as no-one remembers who they are or how they became trapped, and they do not seem to have any need for food or water. The major, being the newest arrival, is the most determined to escape. He is told there is no way of either breaking through or climbing up the cylinder.