Adrian Pasdar for 'Castle' spinoff?

Adrian Pasdar has revealed that his upcoming guest role on Castle could lead to a spinoff series.

The former Heroes star will play hard-boiled FBI agent Mark Fallon in a two-part story arc.

"I got a very nice letter back from [Castle creator] Andrew Marlowe the other day," he explained. "I said, 'Hey how about we do a season ender with Fallon, sort of a backdoor pilot spinoff?'

"Just kind of as a joke, I sent it off saying what a great time I had, and I got a very nice letter saying, 'Well it's not too far off from what we're thinking about'."

According to The TV Addict, Pasdar admitted that he would be happy to reprise the role of Fallon in a new show.

"I was very happy to have been a part of what happened on that show, and I would be the first one in line to say yes to working with those people again," he said.

Marlowe himself added that the character of Fallon "could easily become the centrepiece of a terrific series".

"We here at Castle were very impressed by Adrian's tremendous presence both on and off the screen," he insisted. "I leave any further decisions to the network, but, regardless, I would do a show with Adrian in a heartbeat."

Castle continues on Monday at 10/9c on ABC.