Peter Capaldi's Doctor will waste little time confronting his greatest foe. In "Doctor Who" Season 8, episode 2, "Into the Dalek," the Doctor and Clara will square off with a Dalek fleet, challenging the newfound trust between Doctor and companion.

Warning: "Doctor Who" Season 8 spoilers ahead.

Per the "Doctor Who" Season 8, episode 2 synopsis:  "A Dalek fleet surrounds a lone rebel ship, and only the Doctor can help them now … With the Doctor facing his greatest enemy, he needs Clara by his side. Confronted with a decision that could change the Daleks forever he is forced to examine his conscience. Will he find the answer to the question, “Am I a good man?"

The Doctor is fully back after his regeneration and "Into the Dalek" will not need to delve into the Doctor's identity crisis or with Clara's reluctance after losing the 11th Doctor. At the end of the "Doctor Who" Season 8 premiere, Clara gets some closure with a phone call from the 11th Doctor asking her to trust and take care of the new Doctor. As for Capaldi's Doctor, there is still much to learn about him and pitting the Doctor against the Daleks will be quite the test of character.

Much like the season premiere, "Deep Breath," it appears the Doctor will be faced with a decision to show mercy or harsh punishment. In "Deep Breath," the Doctor casually talked about needing to kill the clockwork droid and the latter's death, whether he jumped or was pushed out, was left ambiguous. "Doctor Who" Season 8 will not forget comedy but will also explore the darker side of the Doctor.

In the "Doctor Who" Season 8, episode 2 preview, the Doctor and Clara are going "into darkness." The clip features a Dalek "Exterminate!" while the Doctor, Clara and the rebels are greatly outnumbered.

"Doctor Who" Season 8, episode 2, "Into the Dalek," airs Saturday at 9 p.m. EDT on BBC America.