>>27557795Channel Chasers ended with Timmy reluctantly accepting the fact that he can't remain a kid forever, and chooses to preserve his memories with Cosmo and Wanda in a lunchbox.
See
>>27557077His children dug it up, and showed it to their father, Timmy, who wasn't able to recognize Cosmo and Wanda. He then goes off to work, leaving his children with a Vicki-esque robot, but they thankfully have Cosmo and Wanda as Fairy God Parents and they (probably) have adventures similar to their dad's.
At the end of this movie he keeps his fairy god parents, gets Tootie, and they travel the world granting wishes.