While TV characters tend to be introduced to shows organically for narrative reasons, some of the most iconic only come into existence due to sheer circumstance. With so many moving parts in the industry, anything from poor ratings to actor availability can shake up a show's formula — and this includes the cast. Some characters introduced in this manner can fall a little flat, as it's sometimes very obvious what the studio is doing by bringing someone new into the fold. That said, even when the audience is aware of what's going on, it's impossible to deny the upside of a forced newcomer's presence.

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