The CN City era was the third era of Cartoon Network. It began on June 14, 2004, replacing Powerhouse, and was the main branding image of the network from that point until April 9, 2006, when it became a secondary brand in favor of Yes! (which began on April 3, 2006). The first program to air under the CN City era was Rescue Heroes. Both "CN City" and "Yes!" went defunct in 2007 just before a 2-day Pokémon weekend marathon started on June 2nd, and were replaced by Summer 2007, which began on June 4th after the Pokémon weekend marathon ended.