Foster's Home for Imaginary Friends - Season 6 Episode 13

The series finale. When Herriman tells Bloo that Mac is moving, Bloo decides to give him the best day ever, though things do not go as he plans. All day, Mac does things with everyone but Bloo, making him angrier after every disappointment. However to everyone's surprise/relief (and Mr. Herriman realizes he forgot to mention this), it turns out Mac is moving to an apartment (the one next door) that was held by Louise's family, and with Cheese unable to follow her because her new home doesn't allow imaginary friends, he moves into Foster's. This was Craig McCracken's final project before he quit his job at Cartoon Network.