The Intervision Song Contest (ISC) is an international song competition originally organized by the International Radio and Television Organisation (OIRT) and broadcast live via the Intervision network. Launched in 1965 as the Eastern Bloc equivalent to the Eurovision Song Contest, its first phase was staged in various cities across Czechoslovakia until 1968.
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | 0 | ||
| Season 1965 | June 1965 | 1 | |
| Season 1966 | June 1966 | 1 | |
| Season 1967 | June 1967 | 1 | |
| Season 1968 | June 1968 | 1 | |
| Season 1977 | August 1977 | August 1977 | 4 |
| Season 1978 | August 1978 | August 1978 | 4 |
| Season 1979 | August 1979 | August 1979 | 4 |
| Season 1980 | August 1980 | August 1980 | 4 |
| Season 2008 | August 2008 | August 2008 | 4 |
| Season 2025 | September 2025 | 1 | |
| Unassigned Episodes | 0 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | 0 | ||
| Unassigned Episodes | 25 |
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