Welcome. Nice of you to finally join us. Hope it was worth the wait. Yes, sometimes a late addition can improve a drama or comedy so much it becomes hard to imagine the show without them. Not every series gets the casting chemistry spot-on straight away. A select few of our favourite TV characters weren’t even on the show when it launched.
We’ve selected 18 characters whose gamechanging arrival in later seasons lifted the whole show and added to its legacy. Behold the super-subs who came off the TV bench and scored a winner …
