Harry Collett, the actor behind Prince Jacaerys Velaryon, has shared heartfelt praise for his on-screen stepfather, Matt Smith (Daemon Targaryen) along with mother Emma D’Arcy (Rhaenyra Targaryen).
In an interview with FluxFM, Collett opened up about how dramatically the veteran actors shift into their characters on set.
Quick read:
- Harry Collett praises on-screen parents Matt Smith and Emma D’Arcy’s range
- He says Matt Smith is completely opposite of Daemon
- Emma brings regality to the set
Harry Collett’s full comments
Talking about Matt Smith, Collett said:
“Matt Smith as Daemon, he fully transforms himself. Daemon is such a good character and Matt is such a bubbly person — such an absolute G. But then when he’s Daemon he’s like ‘I’m Prince Daemon now’ and it’s so funny. It’s really cool to see people because they do flicker switch on and off. Helps me immerse myself into it even more as well.”
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He explained the difference between the person and their character, showcasing the actor’s range.
Matt Smith and Harry Collett (Image: HBO)
Talking of Emma, Harry said,
“Even Emma [D’Arcy], they’re so regal when they’re on set. I mean even Emma — I like watching them on set. They’re so regal when they’re on set and it’s really interesting to see.”
Emma D’Arcy and Harry Collett (Image: HBO)
The “flicker switch” between real life and Targaryen intensity
Collett highlighted the fascinating contrast in personalities. Off-camera, Matt Smith is energetic, fun-loving, and approachable, described warmly as a “bubbly” and “absolute G.” Yet the moment the cameras roll, Smith flips a switch and fully embodies the unpredictable, dangerous, and commanding Prince Daemon.
Similarly, Emma D’Arcy brings a natural regality of a queen to set that instantly elevates the atmosphere. Collett noted how observing these transformations helps him dive deeper into his own performance as Jace.
At 22 years old, Harry Collett has essentially grown up on the House of the Dragon set after being cast at 17. His admiration for his on-screen parents Smith and D’Arcy reflects the mentorship and collaborative energy among the cast.

















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