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"Doctor Who's" star may have said goodbye to the Tardis, but he still feels a deep pang of sadness at leaving what he describes as "the best job in the world."

However, the series is in good hands with Steve Moffat taking over control of the show and introducing a new Doctor for an even newer generation of fans.

"I'm really excited for him," Tennant said in an interview with Newsbeat. "But I remember how exciting it was starting out on this kind of a journey -- and nerve-wracking and a bit overwhelming but just such a kick. So I'm jealous he's [Matt Smith] going through that now but he's brilliant and it couldn't happen to a nicer chap."

Tennant's final chapter on the series is only a handful of episodes away and, according to current showrunner Russell T. Davies, they will be a tearful experience leaving fans reaching for the Kleenex.

What gives these episodes such a dramatic impact is in part the fact that fans are well aware these are his last adventures and so the series can go in directions it hadn't previously considered.

"You can only tell the story of a character dying once," he explained. "It allows you to go to places you haven't quite been before. It allows you to tell types of stories that you can't do when it's an ongoing series. It allows it to be bigger and more epic, and sadder and wilder, and the stakes are just that bit higher."

David Tennant's final "Doctor Who" episodes are set to air in early November and Christmas on BBC, and a schedule yet to be determined on BBC America. "Waters of Mars" will air on BBC America in December.