"Doctor Who" season 8 spoilers reveal the nasty Cybermen returning to haunt the the Time Lord once again, as "Maleficent" star Peter Capaldi mobbed by fans while filming in Cardiff's Queen Street.

Still photos published on MailOnline revealed "Doctor Who" season 8 spoilers as the Cybermen marching down the steps of London's St. Paul's Cathedral on Saturday.

The Cybermen have two origins, one from the planet Mondas, which is supposed to be the earth's twin planet, and the other version is created by Cybus Industries in an alternate universe. Except for the third, eighth and ninth incarnations, every doctor had to fight the Cybermen.

Peter Capaldi, who also plays King Kinloch in "Maleficent," is the 12th doctor.

The 56-year-old actor and Michelle Gomez were also snapped wearing their period costumes as they film scenes along with the other cast and crew.

Meanwhile, in a report by UK's Mirror, Peter Capaldi and Jenna-Louise Coleman along with the Tardis were in Queen Street and were mobbed by fans asking for photos and autographs.

"The doctor and his assistant were filmed chatting at the TARDIS, before he zoomed off, leaving her alone on Queen Street," the publication reported.

"Doctor Who" season 8 spoilers could already be circulating online as executives of BBC are investigating how the scripts and footage landed in the hands of the invidivuals who shared them online.

In same vein, the network's bosses issued a warning that it's illegal to share the footage as they are studying legal ways in order to prosecute the violators.

In a statement released by the network opf the latest "Doctor Who" season 8 leak: "This is part of BBC Worldwide's ongoing security investigation into leaked unfinished Doctor Who materials. This content is currently being removed and originates from the same Miami server we disabled last week."