The Second Doctor is a fictional character from the British science fiction television series Doctor Who. Portrayed by actor Patrick Troughton, he first appeared in 1966 and is known for his playful and whimsical personality, contrasting with his predecessor, the First Doctor. The Second Doctor often used cleverness and charm to navigate challenges and outsmart adversaries. This incarnation of the Doctor introduced the iconic sonic screwdriver and traveled with companions like Jamie McCrimmon and Victoria Waterfield. His era is marked by a shift towards more complex storytelling and darker themes, laying the groundwork for future Doctors in the series.