Additional reporting by Robin Parker.
The series, which Piper co-created alongside Lucy Prebble, stars Piper as a former teen singer turned actress – famous for appearing in a cult sci-fi show – in the midst of a personal and professional unravelling.
During a chat with Radio Times, Tennant praised Piper for “finding a place for herself in the creative community where all her multiple skills can be utilised”.
“Billie’s always been hugely creative and brilliant and it was so exciting to see her doing a massive central performance as well as co-creating and producing,” the Staged actor said. “Someone who I knew to be so extraordinary being allowed to do that on telly, unfettered and uncensored. It was a joy to behold, and now she’s got a feature film.”
Said film Rare Beasts marks Piper’s directorial debut and which she also wrote and stars in.
He added: “To see someone you know and love have that moment is extraordinary.”
It’s always nice to see that one of Doctor Who’s most beloved pairings remain supportive of each other, despite their tenure on the series as the Tenth Doctor and companion Rose Tyler ending more than a decade ago.
Read Radio Times’ interview with David Tennant in this week’s issue, out now. Looking for something else to watch? Check out our TV Guide or visit our dedicated Drama hub.