When asked who’s been his favourite ‘big bad’ on Supernatural, Jensen Ackles found it hard to choose just one favourite because there have been so many really really good ones, but he singled out Mark Pellegrino’s Lucifer for a mention:

Mark Pellegrino’s Lucifer. I did often find myself doing scenes with him and forgetting my lines because I was watching his performance. I think that’s just a testament to Mark and how much fun he had playing that character. So definitely one of my top’s.

Jensen Ackles, Creation Panel 15th November (starts at 20 minutes)

Video: https://www.youtube.com/watch?v=160kznG-5b4&t=1200

A fine choice! Mark and Jensen have some great scenes together.