Hunt for the Thessalhydra is a short adventure published by Wizards of the Coast as a tie in to the "Stranger Things" franchise and part of the Stranger Things Dungeons & Dragons Starter Set. The adventure features characters, locations, and monsters inspired by that series. The adventure is suitable for characters of level 3-5.
An adventure included in the Essentials Kit (2019). The party starts in Phandalin, the starting town for the Starter Set (2014) adventure, Lost Mine of Phandlever. Various jobs are posted by Harbin Wester, townmaster, which the PCs can pursue. These jobs culminate in a raid on Icespire Hold, where Cryovain, a young adult white dragon, has recently claimed as its lair.