He played Potter in both
Koroshi (1967), and
The Girl Who Was Death (1968) (which both starred
Patrick McGoohan). This lends credence to the theory held by some that McGoohan's character in the earlier series (and it's 1/2-hour iteration) is the same person as Number Six. Although McGoohan, who was the co-creator, producer and frequent writer of
Il prigioniero (1967), has repeatedly said (publicly) it wasn't his intention, and 'wished another actor had played Number Six. It's also common knowledge that had he confirmed this, it would've opened him up to having to (financially) compensate
Gioco pericoloso (1964), series creator,
Ralph Smart for this.
