Maybe season one is the best yet, but my personal favorite is season four, since it introduced who would become my favorite housewife.
Season four opens with the aftermath of season three's season finale story arcs. Susan and Mike just got married, Bree is pretending to be pregnant to cover-up Danielle's pregnancy, Lynette discovered she has cancer and Gaby married Victor, oh yeah, and Edie's intent of suicide.
But also on season four's premiere an old neighbor moves back to Wisteria Lane, she used to live there 12 years ago back when only Susan, Mary Alice and Mrs. Mccluskey lived there, her name is Katherine Mayfair, previously known as Katherine Davis. Katherine moves back to Wisteria Lane with her now teenage daughter Dylan and new husband Adam Mayfair (Nathan Fillion) The Mayfairs are this season's "mystery", that involves sexual harassment a daughter that can't remember anything regarding her childhood and a possible murder.