Which Nickelodeon series starred Kenan Thompson and Kel Mitchell as step-brothers?

Which network aired 'Hannah Montana'? Who played Hannah Montana / Miley Stewart? Which Disney Channel series starred Selena Gomez as Alex Russo? Which Disney Channel series starred Hilary Duff? Which Nickelodeon series featured Miranda Cosgrove running a web show? Which Nickelodeon series starred Drake Bell and Josh Peck? Which series is a spin-off of 'Happy Days' starring Robin Williams as an alien? In 'ALF', what planet is ALF from?