6. Jason Alexander
In real life: Alexander is mostly recognised for his long-running turn as George Costanza on Seinfeld.
In addition to his acting work, he’s a committed poker player and often hits the tables at celebrity tournaments.
In Star Trek: Slathered in latex that disturbingly makes it look like he has ladyparts for a forehead, Alexander plays Kurros on the Voyager episode ‘Think Tank’.
It sees a group of aliens offer the crew help with a nasty bounty hunters if they will leave sexy – and brainy - Borg lady Seven Of Nine (Jeri Ryan) behind to help with their work.
It doesn’t go well for the brainiacs.
Did you know? Alexander loves being a viewer, but never wanted a regular gig on the show: ''They work long, brutal days, the material is filled with lots of technobabble that's not easy to learn, there's lots of special effects work and smoke sets,'' he says. ''The fantasy of watching is great, but reality is it's a very hard job.”