The New Addams Family (1998)

Season 1: Episode 17

Cousin Itt was very disappointed that he didn't get the role of Hamlet at the theatre. So Gomez dusts off an old play he wrote, casts Itt as the lead, and hires a director for it. The director refuses to work with Itt because his voice is not deciferable. So Morticia trys to get Itt to slow and lower his voice. Itt's voice changes, but so does his personality.