15 terrible guest stars that almost ruined great TV series

A great guest star can really elevate a TV show.

There are countless examples of TV series bringing in brilliant ringers, famous or otherwise, for short arcs – think Dustin Hoffman in The Simpsons or Matt Damon in 30 Rock.

The best actors need only a scene to prove their worth to viewers. But what about those guest stars who aren’t so great? Things can sometimes go wrong just as quickly.

Often, it’s a matter of a celebrity looking to use a popular series to boost their profile – or, as in the case of Donald Trump appearing on Fresh Prince of Bel-Air, to simply stroke their ego. Other times the problem has more to do with the writing, or a wayward bit of casting.

Here’s a list