This episode hooked me right from the get-go and I was invested for the rest of the ride. "Time Heist" is an interesting, exciting episode with a few nice twists up its sleeve and an excellent monster to protect them.

As is usual by this point, the Doctor and Clara were incredibly entertaining and fun to watch. Their banter never fails to make me smile.

The episode's supporting cast were very good too. Psi, Saibra, and Ms. Delphox all proved to be very interesting characters with enough depth to keep me invested in their respective dilemmas.

The Teller, for me anyway, will go down as one of the best monsters introduced in Series 8. Its introduction scene is easily the best monster introduction in recent years.

The production design was excellent and the world of the Bank of Karabraxos was wonderfully vibrant. For the most part, the episode is well paced but it's definitely an episode that could have used a few more extra minutes at the end.

Overall, "Time Heist" was a highly enjoyable episode with good supporting characters and a few interesting twists.