'Doctor Who' season 10 news, spoilers: New trailer hints more thrilling adventures; who will play the next Doctor?

A promotional image for "Doctor Who" | BBC

"Doctor Who" officially premieres this spring, and a new trailer featuring Peter Capaldi's last stint as the Time Lord has been released.

The new teaser shows the Doctor (Capaldi), along with his new companions Bill (Pearl Mackie) and Nardole (Matt Lucas), walking through an exploding library hallway when ghostly creatures come calling. The 30-second clip wraps up with a short glimpse of enemies that will arrive in future episodes, including the Ice Warriors. Daleks and Cybermen villains could also be coming back. At some point in the video, the Doctor is dubbed as "the most dangerous man in the universe," hinting he will be facing a lot of obstacles this season.

Season 10 marks Capaldi's last stint as the Doctor, which means that a new actor will soon replace him. While the network still hasn't announced possible candidates for the lead role, there have been speculations that the new actor will either be black or female.

David Harewood is one of the names being floated around for the iconic role. The "Supergirl" actor spoke with BBC News, and he shared his thoughts about the possible behind-the-scene shakeup. "It's nice to be in the running," he said. "It needs to do something different, so I think it's either going to be a black person or a woman. It would just bring a different flavour to it," the actor added. Aside from playing the Martian Manhunter in The CW's superhero series, he also appeared in "Homeland" and "The Night Manager."

Also being suggested to replace Capaldi is Tilda Swinton. In an interview with The Scottish Sun, Swinton's former partner John Byrne said casting the actress as the Time Lord would be a "genius" move by the network, although he hasn't been given insider knowledge about the matter. Swinton is best known for her roles in "Doctor Strange," "The Chronicles of Narnia," and "We Need to Talk About Kevin."

The 10th season of "Doctor Who" premieres on Saturday, April 15, at 9 p.m. ET on BBC