<\/p>\n
TV fans know Christopher Chung<\/a> for playing tech specialist Roddy Ho on\u00a0Slow Horses<\/a><\/em> \u2014 he\u2019s at the center of the story in Season 5, with what may have been an attempt on his life already in the premiere<\/a>, which dropped on Apple TV+ on September 24 \u2014 but he also appeared on another well-known series in 2025:\u00a0Doctor Who<\/em><\/a>.<\/p>\n Chung guest starred in \u201cThe Well\u201d as Cassio Palin-Paleen, a trooper who tried going toe-to-toe with the Doctor (Ncuti Gatwa<\/a>), refusing to listen to his orders and believe his warnings about what was responsible for a series of grisly deaths in a base on a planet.<\/p>\n \u201cIt was cold, it was wet. I got to wear a space suit, which was great fun, and I got to work on a show that\u2019s so worldwidely iconic, which I never thought I\u2019d get to do and to work with Russell T Davies<\/a> was an absolute joy,\u201d Christopher Chung tells TV Insider. \u201cI had a great time doing it. And I got to meet Ncuti. So it\u2019s just fun going into a sci-fi, something completely different to Slow Horses<\/em>. So, I\u2019ve been really gifted with the roles that I\u2019ve gotten to play in between doing Roddy, but they\u2019re all very varied and different.\u201d<\/p>\n The Doctor soon realized that he had been to the planet before \u2014 back when it was made of diamonds. \u201cThe Well\u201d was a sequel to \u201cMidnight,\u201d<\/a> from when Davies was previously showrunner and when David Tennant<\/a> played the Time Lord.<\/p>\n \u201cWhen I was auditioning for it, I had watched it. They did send it as a reference,\u201d Chung said of that previous episode. \u201cI didn\u2019t realize how iconic it was, but yeah, when people knew that that episode was going to be a continuation and a follow-up, that was really exciting.\u201d<\/p>\n Cassio\u2019s refusal to listen to the Doctor did ultimately result in his death. He took control from his leader, Shaya (Caoilfhionn Dunne), declaring a red code, for an incompetent leader, and his actions eventually led to Shaya putting him directly behind Aliss (Rose Ayling-Ellis<\/a>), to whom the entity had attached itself. Those who ended up in that position, at \u201cmidnight,\u201d were killed. She explained that she had to because he was out of control. \u201cIt\u2019s what it turns us into,\u201d the Doctor said.<\/p>\n