Patrick Stewart is a celebrity guest-star in Family Guy: The Quest for Stuff. He is the first character unlocked during the Quahog Comic Con event and is unlocked relatively early in the quest procedure. He also made a return in the 2015 The Long Comic-Con mini event. He appeared in the Dr. Rupert Mystery Box along with various other characters/outfits. This was available for purchase at 125 . He is voiced by Patrick Stewart.
After the event if you unlocked him, you could get his chair for free at the shop.