Marry Me

S1, E18: Just as Zack and Kelly are getting pretty close, Kelly is accepted to the Semester on the Sea program, which involves a three-month cruise. Zack doesn't want Kelly to go, but she feels it's an opportunity she can't pass up. Zack tries to get accepted into the program as well, but none of his schemes work. He tries to get Screech to quit the program by scaring him, but that backfires. Zack has a dream that Kelly is with another guy on the ship. When he wakes up, he goes into Kelly's room, wakes her up, and asks her to marry him. Kelly says she has to think about it--and she's still going on the cruise.