The TF animated and comic series haven't really been continuous. Big gaps between G1 and G2 and Beast wars cartoons. Smaller gap between G1 and G2 comics and then big gap before the Dreamwave stuff. The toyline itself also has that little gap between G1 and G2 (not it wasn't as noticeable in the Australian)
In general though the only thing that comes close IMHO is the Star Wars toys but I think they even stopped selling SW toys for a while before the Special Edition movie rereleases.