Robert Llewellyn is an English actor, comedian, presenter and writer. He plays the mechanoid Kryten in the sci-fi television sitcom Red Dwarf and formerly presented the engineering gameshow Scrapheap Challenge. He has also founded and hosts a YouTube series, Fully Charged, which has grown into a company that puts on EV and "Everything Electric" conventions in the UK, USA, Canada, Australia and Europe.

Kryten is a fictional character in the British science fiction situation comedy Red Dwarf. The name Kryten is a reference to the head butler in the J.M. Barrie play The Admirable Crichton. Originally referred to as a Series III mechanoid, he is later described as a 4000 Series, or Series 4000.