10 Big Stars You Forgot Appeared In The World Of Doctor Who

There have been all manner of Doctor Who charity sketches and crossovers over the years, but it's rare for one of the spin-off series to get in on the act. Torchwood, for example, never crossed over with Hollyoaks. It just felt like it did.

One exception was the Sarah Jane Adventures, which got involved with Red Nose Day in 2009, to raise money for Comic Relief. In a sketch known as From Raxacoricofallapatorius With Love, Sarah Jane and her team come face to face with an alien ambassador played by UK comedy legend Ronnie Corbett. Given that it's Comic Relief, the alien part is a very thin veil, as Corbett deploys his various trademarks - a love of golf, delivering monologues from a comfortable chair and, of course, Sarah Jane gets to say "a goodnight from him" when she dispatches him once his true colours are revealed.

For Ronnie, or Rahnius, is revealed to be a Slitheen who is intent on capturing K-9, and using the robot dog's knowledge and capabilities to rule the galaxy. He's very quickly found out and dispatched in a fun, throwaway scene that also has the honour of introducing deadly deely boppers to the world of Doctor Who.