Captain Oishi is the 100th episode of the original Prince of Tennis. It originally aired on the 17th September 2003.
In the absence of Tezuka, a tense Oishi puts the team through its paces.
While Tezuka is in the middle of his rehabilitation in Germany, Substitute Captain Oishi finds it difficult to be captain as he struggles to control his teammates. He designs a special training program for everyone which he commands everyone to take part in, however none of the other Seigaku members listen to him and just practice on their own, as usual.
Can Seigaku really win the Kantou tournament with Oishi as Captain?