More than 100 Hartlepool United supporters swapped the blue and white of their beloved Pools for black and white costumes.
They kept up the tradition of travelling to their last away match of the season in fancy dress. Last year, 100 of them travelled to Charlton Athletic dressed as Smurfs.
This year, dozens of happy feet headed to the home of Crawley Town.
Pools pulled off a 2-2 draw and it was a p-p-perfect pick-up after a season which saw Pools relegated from League One.
As Hartlepool United took a 2-1 lead through a beauty from Andy Monkhouse, Hartlepool-born Jeff Stelling and the team of football pundits on Sky Sports’ Soccer Saturday began a chorus of penguin honking noises.
Fans of social media took the Penguin Army to their hearts as well and the web was soon full of photographs of Pools fans waddling through London.
At one point, 138 fancy dress fans packed onto the Tube much to the amusement of passers-by.
The penguin army were so popular, they were trending on Twitter across the UK.
John Pearson, who organised the costume choice, said: “It put a smile on everyone’s faces especially when we were in the ground singing the Birdie Song and I Believe I Can Fly.”
Penguin-clad Scott Llewellyn added: “We didn’t think we could beat last year’s fun but it was brilliant and that’s down to John Pearson who organises it all.”
The match ended in a 2-2 draw and Pools will be playing League Two football next season after being relegated.
But their end-of-season antics were Premier League.
• More Poolie penguin pictures in Tuesday’s Mail.