According to SciFi Wire, Tricia Helfer is joining the cast of Fox's "Them". According to TV Guide, it's "entirely possible that Helfer will join both series". Somehow, that doesn't really ring true to me. Prompts me to try to think of the last time an actor appeared in two concurrent television shows (there are probably a fair number of examples: I just can't really think of any at the moment). Are Six's days numbered?