A biochemist develops a process that reverses ageing but, when he disappears, it's up to Napoleon Solo and Ilya Kuryakin to recover or destroy the process before it falls into the hands of the THRUSH.

Directed by: E. Darrell Hallenbeck
Written by: Howard Rodman
Runtime: 100 minutes
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Cast:
Robert Vaughn Robert Vaughn
Napoleon Solo 
Maurice Evans Maurice Evans
Sir Norman Swickert 
James Doohan James Doohan
Phillip Bainbridge 
Leo G. Carroll Leo G. Carroll
Alexander Waverly 
Ahna Capri Ahna Capri
Do Do (as Anna Capri) 
Yvonne Craig Yvonne Craig
Wanda