Dick Powell's Zane Grey Theatre (1956)

S19E1 Castrovalva (1)

In Southern England, 1981, the universe is safe once more, but it came at a heavy price—the fourth Doctor has perished. Now, the freshly regenerated fifth Doctor finds himself in a precarious situation, relying on his companions to help him navigate his new form, as the regeneration process teeters on the brink of collapse.