Family Guy/Batman

Cast:

 * Peter Griffin - Robin/Dick Grayson


 * Chris Griffin - Batman/Bruce Wayne


 * Lois Griffin - Catwoman/Selina Kyle (I know Catwoman is bad, but Lois is seductive)


 * Meg Griffin - Batgirl


 * Brian Griffin - Alfred (both loyal)


 * Stewie Griffin - Penguin (both small and evil)


 * Ernie the Giant Chicken - Joker (the giant chicken and Joker are the main villains)


 * Bertram - Riddler


 * Connie D'Amico - Poison Ivy


 * Joe - Commissioner Gordon


 * Cleveland Brown - Lucius Fox


 * Quagmire - Dr. Jonathan Crane/The Scarecrow