Which Nickelodeon series starred Drake Bell and Josh Peck?

Which Disney Channel series starred Selena Gomez as Alex Russo? Which Disney Channel series starred Hilary Duff? Which Nickelodeon series starred Kenan Thompson and Kel Mitchell as step-brothers? Which Nickelodeon series featured Miranda Cosgrove running a web show? Which series is a spin-off of 'Happy Days' starring Robin Williams as an alien? In 'ALF', what planet is ALF from? In 'Mork & Mindy', which planet is Mork from? Which show is a spin-off of 'The Cosby Show'?