Experimenting on making guinea pigs invisible by lowering their refractive index to that of air, Dr. Peter Brady becomes invisible himself after a radioactive leak. Brady becomes front page news and a target for a ruthless criminal gang who kidnap Sally, forcing Brady to use his invisibility to steal £50,000 from a bank in order to pay the ransom for her safe return.
| Name | Type | Role | |
|---|---|---|---|
| Ralph Smart | Writer | ||
| Doreen Montgomery | Writer | ||
| Lisa Daniely | Guest Star | ||
| Willoughby Goddard | Guest Star | ||
| Robert Beatty | Guest Star | ||
| Lloyd Lamble | Guest Star | ||
| Kenneth Edwards | Guest Star | ||
| Deborah Watling | Guest Star | ||
| Ernest Clark | Guest Star | ||
| Ralph Smart | Director |