Episode 126 of "Spin City"
s6e03 Wife with Mikey
Title: Wife with Mikey
Original Air Date: 10/02/2001 on ABC
Plot Outline:
Mike calls off his engagement with Allison and increases his presence in the office, making Charlie feel threatened. However, Charlie talks him into staying with Allison and marrying her--in City Hall. Meanwhile, Caitlin helps the mayor dress like a woman for a charity event.
