Runner Up: 'The Twin Dilemma' and 'The Trial of a Time Lord' (tied)
https://www.youtube.com/watch?v=4GXfH70OrHAVideo can't be loaded because JavaScript is disabled: The Third Doctor's First Appearance (HD) | Spearhead From Space | Doctor Who (https://www.youtube.com/watch?v=4GXfH70OrHA)
Worst Visuals: 'Spearhead From Space' – January 3, 1970
The visuals here are so disorienting, so bright, so dizzying, and so very 1970's[...]
