Semi Finals 1
- Episode aired Feb 4, 2017
![Ninja Warrior UK (2015)](https://m.media-amazon.com/images/M/MV5BMTVlOTMyNzYtYzUwNy00NTVmLTgyYmEtZDQ4OWVkMGRmMzNhXkEyXkFqcGdeQXVyMjYwNDA2MDE@._V1_QL75_UY281_CR2,0,190,281_.jpg)
The best competitors from the heats return to face not six, but nine obstacles on the course. The quickest 15 of the 50 semi-finalists will earn a place in the final.The best competitors from the heats return to face not six, but nine obstacles on the course. The quickest 15 of the 50 semi-finalists will earn a place in the final.The best competitors from the heats return to face not six, but nine obstacles on the course. The quickest 15 of the 50 semi-finalists will earn a place in the final.