Question: where to watch old episodes of the challenge?
Answer: MTV.com. If you have cable, MTV.com has some Challenge seasons. ... 
Internet-Based Cable. If you're looking to watch The Challenge and you're main go is just The Challenge, I recommend Philo. ... 
Streaming Channels. ... 
Free Online Streaming. ... 
Purchase Seasons. ... 
The Gray Zone. ... 
Bonus: The Challenge YouTube.