Out of Sight is the seventh episode of Speed Buggy. It first aired 20 October 1973.
In Egypt, the gang come to the aid of Professor Rigby, who's fleeing from his evil colleague, Professor Rishna. While uncovering an ancient tomb, they discover a formula for an invisibility potion. Rishna uses it on himself hoping to steal various treasures and rule the world.
Rigby created an antidote to the potion. But Rishna and his assistant, Abdul, want to stop him from using it. After the villains kidnap Mark and Debbie, Tinker and Speedy come to their rescue, but not before the whole gang get into a little game of "Now you see me, now you don't" as the invisibility potion is passed all around.