This story is not very good. Everyone in the TARDIS goes mad for a bit. You can see this in the picture, where Susan is trying to kill Ian with some scissors. Ian is just staring at her, evidently unbothered by her homicidal frenzy. Ian is very calm, and wears a cardigan with unusual dignity.
Later in the story Doctor Who gives a big speech about space. Ian is now wearing an exciting space dressing gown.