The Mid-Season Invitational (MSI) is an annual League of Legends international tournament hosted by Riot Games in the middle of years, since 2015. It is the second most important international League of Legends tournament aside from the World Championship. In 2015 the event featured the Spring Split champions of the five major competitive League of Legends regional leagues (LEC, LCS, LCK, LMS, LPL), as well as a wildcard team
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | 0 | ||
| Season 2015 | May 2015 | May 2015 | 28 |
| Season 2016 | May 2016 | August 2016 | 58 |
| Season 2017 | April 2017 | May 2017 | 78 |
| Season 2018 | May 2018 | May 2018 | 74 |
| Season 2019 | May 2019 | May 2019 | 79 |
| Season 2021 | May 2021 | May 2021 | 81 |
| Season 2022 | May 2022 | May 2022 | 80 |
| Season 2023 | May 2023 | May 2023 | 76 |
| Season 2024 | May 2024 | May 2024 | 78 |
| Season 2025 | June 2025 | July 2025 | 80 |
| Season 2026 | 0 | ||
| Unassigned Episodes | 92 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | 0 | ||
| Unassigned Episodes | 804 |
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