Opportunity Knocks Episode #21.1 (1956–1990) Online
- Original Title :
- Episode #21.1
- Genre :
- TV Episode / Game Show
- Year :
- 1956–1990
- Cast :
- Bob Monkhouse,Ione Brown,Reading Mormon Choir
- Writer :
- Paul Alexander
- Type :
- TV Episode
- Rating :
- 6.2/10
| Episode complete credited cast: | |||
 | Bob Monkhouse | - | Himself - Host |
| Rest of cast listed alphabetically: | |||
 | Ione Brown | - | Herself - Impressionist / Margaret Thatcher / Cliff Richard / Dame Edna / Paul Daniels |
 | Reading Mormon Choir | - | Themselves |
| Comisar | - | Themselves - Three Singing Brothers |
| Jane Harrison | - | Herself - Last Year's Winner |
| Morgan Lee James | - | Himself - Opera Singer |
| National Philharmonic Orchestra | - | Themselves |
| Sid Scouse | - | Himself - Deadpan Comedian |
| Zoe Tyler | - | Herself - Singer |