Opportunity Knocks 1990 Grand Final (1956–1990) Online
- Original Title :
- 1990 Grand Final
- Genre :
- TV Episode / Game Show
- Year :
- 1956–1990
- Cast :
- Les Dawson,Mark Rattray
- Type :
- TV Episode
- Rating :
- 6.3/10
| Episode credited cast: | |||
 | Les Dawson | - | Himself - Host |
| Rest of cast listed alphabetically: | |||
| Mark Rattray | - | Himself - Musical Theatre Singer |