The fourth season finale of Marvel's Agents of S.H.I.E.L.D. airs on E4 tonight. The show is set in the same Marvel Cinematic Universe as the Avengers films and follows the organisation S.H.I.E.L.D., a spy agency working to keep peace in a world of superheroes. The series revolves around Phil Coulson (Clark Gregg), and in tonight’s episode, following the surprising emergence of Ghost Rider (Gabriel Luna), Coulson and his team of agents attempt to stop AI computer AIDA from destroying the world. Season five debuts in 2018.