The first interplanetary rockets could carry with them bacteria from earth which might contaminate other planets. Returning spacemen might bring back new and dangerous bacteria which could endanger our existence here. Patrick Moore, Sir Bernard Lovell, and Dr. Francis Jackson give their views on this vital aspect of space travel.
| Name | Type | Role | |
|---|---|---|---|
| Prof Sir Bernard Lovell | Guest Star | ||
| Dr George Hobby | Guest Star |