David Lascher portrayed Vinnie on Blossom with Joey Lawrence for 48 episodes. He portrayed Josh on Sabrina the Teenage Witch with Melissa Joan Hart for another 48 episodes. With the 3 episodes he plays Charlie on Melissa and Joey, David played in 99 episodes between the two main actors.
Both David Lascher and Elisa Donovan starred on Sabrina, the Teenage Witch with Melissa Joan Hart. Before that they starred together on Clueless the series which is based on the 1995 film of same name that Elisa Donovan also starred in.
Sterling Knight and Meghan Martin both worked with Demi Lovato on Disney. Knight on Sonny with a Chance and Martin in Camp Rock