10 Best Actor Replacements On TV Shows

3. Robert Llewellyn Replaced David Ross - Red Dwarf

When Red Dwarf's iconic service droid Krysten was first introduced in the legendary sitcom's second series, he was originally intended to be a one-off character as played by David Ross.

But Kryten's popularity led creators Rob Grant and Doug Naylor to bring the character back as a mainstay member of the Red Dwarf crew in series three, and with scheduling conflicts preventing Ross' return, he was swapped out for Robert Llewellyn.

And Kryten more-or-less felt like a totally different character in Llewellyn's hands - less snippy and instead more goofy and earnest, as made him such a brilliant contrast to the likes of Lister (Craig Charles) and Rimmer (Chris Barrie).

This isn't to disparage Ross' performance in his single episode whatsoever - his work was perfect for that single outing, but long-term it absolutely made sense to replace him with an actor whose personality better suited a Kryten who would be sticking around.

Ross' Red Dwarf tenure didn't quite end there, though - he also provided the voice for Talkie Toaster in the show's fourth and twelfth seasons.