Air date: December 16th, 2019 (UK), August 17th, 2019 (US)
Hurrying back home one snowy morning after being delayed, Percy avoids falling into the turntable well on the icy rails at Tidmouth Sheds. Nia warns everyone about the dangers snow could bring, harking back to her accident in China. Percy, intimidated, suggests that they all stay in the sheds but Emily and Thomas persuade him otherwise. Thomas tells Percy to enjoy the snow and that he will meet him later at Knapford Station.
As he goes throughout his day, Percy becomes very paranoid about the snow, imagining potential accidents where there is nothing wrong at all. However, Percy really starts panicking when Thomas is nowhere to be seen at Knapford. Thinking he has been caught in an avalanche like Nia was, Percy recruits Rebecca, and Duck along in passing, to help him find his best friend. After Rebecca leaves to search the Main Line, Percy rushes along the Little Western alone worrying over nothing. Then, he turns a corner too quickly and is derailed.
Meanwhile, as she alerts others to let them know the news of Thomas being missing and involved in an accident, Rebecca finds him at Brendam Docks— she is puzzled to see that he is absolutely fine.
Percy, still derailed, is found by Nia, along with Harold, Rebecca, Emily, Duck, Henry and Gordon— who mistake Percy for Thomas— and lastly, Thomas himself. After Thomas explains that he was just diverted to deliver extra salt for the icy roads, preventing him from returning to Knapford, Percy apologises and promises to never again panic over nothing. He does exactly that after realising James is absent, only for him to show up at that moment, indignant at not having been invited to their "gathering."
This episode contains examples of:
- Alliterative Title: Panicky Percy.
- An Aesop: Don't panic over nothing.
- "Everybody Laughs" Ending: The other engines (except for Gordon) laugh after Percy panics again.
- Flashback Cut: The episode plays a flashback where Nia is stuck on top of a hill in Big World! Big Adventures!.
- Here We Go Again!: After Percy promises not to panic again, he starts panicking about James' disappearance until James shows up.
