Dick Powell's Zane Grey Theatre (1956)

S15E26 The Invasion of Time (6)

The Sontarans successfully breach the TARDIS, intent on seizing the Great Key. Meanwhile, the Doctor has plans of their own for this formidable artifact, leading to a tense confrontation aboard the time machine. As the Sontarans close in, the Doctor must outsmart them to protect the key’s true potential and prevent disaster.