TV Article Big Bang Theory: Stephen Merchant, Analeigh Tipton set to guest-star By Natalie Abrams Natalie Abrams Senior Writer EW's editorial guidelines Published on October 21, 2015 08:28PM EDT Photo: Jon Kopaloff/FilmMagic; Sonia Recchia/Getty Images Stephen Merchant and Analeigh Tipton will guest-star on an upcoming episode of The Big Bang Theory, EW has learned. Details on their roles are being kept under wraps, but their characters are rumored to interact with Sheldon (Jim Parsons) and Amy (Mayim Bialik). One thing we can reveal is that Tipton (Manhattan Love Story) will be playing a new character. As viewers may recall, Tipton previously appeared as herself when Howard (Simon Helberg) and Raj (Kunal Nayyar) tried to sneak into the America’s Next Top Model house in season 2. The Big Bang Theory airs Monday at 8 p.m. ET, before moving to its regular timeslot of Thursday at 8 p.m. ET on Nov. 5 on CBS.