Rex Robinson credited as playing...
Dr. Tyler
- Jo Grant: Do you know where we are, Dr. Tyler?
- Dr. Tyler: Uh, no, I don't. Do YOU, Doctor?
- Dr. Who: Yes. We're at the other end of that light streak of yours.
- Dr. Tyler: What?
- Dr. Who: We've been transported along it.
- Dr. Tyler: That's in the black hole.
- Dr. Who: That's exactly it. That's where we are - on a stable world in a universe of antimatter, an anomaly within an impossibility.