Firefly, Farscape and Invader ZIM. An epic western themed space opera, another science fiction show that had some of the most amazing make-up I'd ever seen - it was always very funny - and a kids TV show (that eventually got an older audience) about an egotistical extraterrestrial who fails spectacularly to take over/destroy mankind.
While Invader ZIM might be coming back, the other two are not, unfortunately. Love those shows.
Ugly Betty, Freaks & Geeks (although I can now get my Daley fix via Bones, so that isn't so bad) and House. I miss House SO much, it actually hurts to think about it.
The Thundercats remake/reboot didn't exactly get cancelled, but it's been sort of terminated (until they can pick it up again. I loved it a lot, but the Cast and Crew suddenly left it for other projects. Another reason got 'cancelled' is because of low ratings it got on Cartoon Network, but yet, it's widely popular in the online fanfic communities...
@ FrankinGerard Especially with that awful excuse for a last episode. They could’ve ended on Titans Together with a nice happy note, but they had to try and give Beast Boy ‘closure’ in Things Change. It just meant there were about 50 more unsolved questions and a monster they couldn’t beat on the loose.
And I’m not looking forward to Teen Titans Go! It’s supposed to be about the lives of the Titans when they’re just at the tower doing their laundry and having arguments. I really never cared about any of that. It’s the action and the story arcs and character development that made it such a great show, so I don’t get why everyone’s so excited that it’s coming back in the new form.
Veronica Mars, Beauty and the Geek, Big Wolf on Campus, Fox Family, Brooke Knows Best, Buffy, Angel, Bully Beatdown, The Buried Life, Cheyenne, Cribs, My Super Sweet 16, WildBoyz, Ghost Whisperer, ect. So many more.