Little is known about Dot and Bubble at this time, but guest stars Callie Cooke (Henpocalypse!<\/a>, Peacock<\/a>) and Tom Rhys Harries (White Lines, The Split<\/a>) are confirmed to appear.<\/p>\n The latest ratings for Doctor Who season 14 showed that 2.04 million tuned into last week\u2019s episode \u2013 simply titled Boom<\/a> \u2013 as it went out, with that number expected to grow when iPlayer streams are factored in over the first seven days.<\/p>\n For comparison, the overnight ratings of the double-bill premiere \u2013 Space Babies<\/a> (2.6m) and The Devil\u2019s Chord<\/a> (2.4m) \u2013 rose significantly when consolidated with viewing across the first weekend, jumping to 4.01m and 3.91m respectively.<\/p> The season has been particularly effective at planting intriguing mysteries, from the snow that appears whenever Ruby (Millie Gibson) is in peril to the repeat appearances of Susan Twist<\/a> that have fuelled speculation on who she could be playing.<\/p>\n Another surprise came in Boom, when Andor<\/a> star Varada Sethu<\/a> made her Doctor Who debut as Mundy Flynn<\/a>, having been confirmed as a new companion for season 15 (in addition to Gibson\u2019s Ruby, rather than replacing her).<\/p>\n In response to the shocked reaction, episode writer Steven Moffat said: \u201cThere is a plan. That\u2019s all I\u2019m telling.\u201d<\/p>\n On the other hand, Sethu\u2019s comments on Doctor Who Unleashed gave a more spontaneous impression of her (re-)casting.<\/p>\n \u201cI was just in it for the ride, I had a great time for those three weeks,\u201d she said. \u201cI was devastated to be leaving because I had so much fun but I didn\u2019t know anything about it. That call came much later, months and months later.\u201d<\/p>\n The appearance has already been compared to Jenna Coleman showing up as variants of Clara Oswald prior to her companion\u2019s introduction, but that wasn\u2019t the first time in revived Doctor Who when such a situation arose.<\/p>\n Freema Agyeman appeared in the season 2 finale as Adeola \u2018Adi\u2019 Oshodi, before stepping into the role of Martha Jones in season 3. Adi was later retconned to be Martha\u2019s cousin, with whom she bears a striking resemblance.<\/p>\n Perhaps the mystery of Sethu\u2019s Mundy could be solved just as easily? We\u2019ll have to keep watching to find out!<\/p>\n![\"Varada](\"https:\/\/images.immediate.co.uk\/production\/volatile\/sites\/3\/2024\/05\/Varada-Sethu-1ff3184.jpg?quality=90&resize=620%2C413\" "\\"Varada")
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