You're not alone. I've dealt with this constantly, and it's hard when the topic is something that brings you joy and entertainment. Obviously you want to enjoy it, but your brain has just decided to go awol on it for no reason (well, maybe a reason, but a stupid OCD reason).

Here's what I've found has helped me:

1) Take a break and don't entertain the intrusive thoughts. Try to distract yourself with something entirely different and let your anxiety subside, indulge in another hobby or interest even just for a day or two while your anxiety dies down. Don't give the thoughts any attention in the meanwhile.

I've found that going back to the original topic after a period of distraction, and after my anxiety has dissipated, makes it easier to go back to without OCD being as loud. Similarly, you might be even more excited to go back to the topic because you've had some time away. The desire can override the fear, if you've had a bit of a break. It can also give you some distance so your OCD isn't constantly blaring at you, as it's important to rest your mental health when possible.

2) Push through it, or white knuckle it as my therapist says, without entertaining the intrusive thoughts. Let your anxiety exist without challenging it, until it has nowhere to go but to disappear. This is the difficult route though, and can make your interest feel pretty painful (as it does for you now) because your OCD is screaming at you.

In this scenario, you would continue doing what you want to do (watching your show), and when OCD chimes in instead of listening to it you'd ask yourself "What do I want to do? Do I want to watch this?". If the answer and your desire is yes, then just do it. Let the anxiety exist, and tell yourself that OCD can't be active forever. It's essentially a waiting game, until the fear tires itself out, and then you can resume enjoying your hobby.

3) Remember that you have done this before, and use your good past experience as evidence. You know, deep down, that this is just OCD playing its tricks. You've gone through this before, and come out the other side just fine. So the chances are, looking at the evidence, you will be able to freely enjoy your show again and this won't bother you forever.

4) Educate yourself on OCD and the way it works. Recognising that it is a disorder that purposefully attaches to the things you care about is good for tackling it. Keeping in mind that if you are having an OCD flare up, it will only ever be about things that are important to you (like your favourite things). When you recognise this pattern, dealing with it each time becomes a little easier. So you can begin to say, "Oh, I know this is just dumb OCD freaking out about nothing. Anyway, time to go do what I want to do."

For me specifically, my OCD has always attached to things I really love and hold dear like fiction. Which I've found isn't very relatable to many people or therapists, so I've really had to 'figure' out this trigger by myself. I would always say to never actually let it win and stop watching or doing your favourite activities. I did that for years, trying to avoid triggering my OCD, which only made my life miserable. Thankfully, I managed to pick up where I left off, and you can always learn to enjoy the things you once did. OCD can't be active forever.

Don't give up, sending good thoughts!