Bananas play a large role in Doctor Who and are mentioned almost every episode.
Banana appearances in Doctor Who
The 10th Doctor teaches us to always bring a banana to a party. He thought the plasmavore was going to give him a banana milkshake, someone has got one hell of a fetish.
The 11th Doctor used his old trick of switching a gun to a banana to stop Mel Pond (River Song) from shooting him. He also defeated a wooden Cyberman with a banana, because a wooden Cyberman is susceptible to bananas like normal metal Cyberman are susceptible to gold.
Contrary to popular belief, the banana is
not a tangerine.
A spin-off about the banana was written by Russell T. Davies.