My favourite character is Willy Armitage. I like Willy a lot. Here is a picture of him:
He is played by Peter Lupus and is the strongest character in Mission: Impossible. He is clever too. Here is another picture of him, this time he has a moustache:
Like most of the characters in Mission: Impossible, Willy is a master of disguise. Here his moustache is part of his disguise, along with his glasses and hat.
Gamma Longcat also likes Mission: Impossible (in fact all cats like Mission: Impossible because it is great), but his favourite character is Barney Collier:
He is played by Greg Morris. Here is a picture of Barney with a moustache:
Leonard Nimoy appears in season 4 of Mission: Impossible, but he is not playing Mr Spock. He plays Paris, who is so good at disguise he can pretend to be a city in France. This is because Leonard Nimoy was no longer needed to play Mr Spock because they had stopped making Star Trek. I don't know why but I think it was because they had already made all the episodes.
Other actors from Star Trek were guests in Mission: Impossible, but none of them played the same characters which is a shame because they could easily have time-travelled to the 1960s to be in it. These guest-stars included George Takei, William Shatner and Ricardo Montalkhan. Each of these episodes are brilliant.