Nathan Fillion has apparently enjoyed his time working at ABC, because he's signed on to a pilot at the network.

Alyssa Milano and Aunjanue Ellis have also joined ABC projects, while Tom Hollander is booked on a CBS dramedy.

Fillion, who's had a recurring role on "Desperate Housewives" this season as Dana Delany's husband, will star in a presentation called "Castle," according to The Hollywood Reporter. The "Drive" and "Firefly" star will play a mystery novelist who consults with the NYPD on difficult cases.

His credits also include "Waitress," "Miss Match" and "Buffy the Vampire Slayer."

Milano, meanwhile, is attached to a comedy from writer Kristin Newman ("That '70s Show," "How I Met Your Mother"). She'll play a woman who's trying to break free of her dysfunctional family, toxic friends and annoying boss. The former "Charmed" star is currently in a recurring part on NBC's "My Name Is Earl" and starring in the feature film "Pathology," which is in limited release.

Also at ABC, Ellis ("Ray," "Justice") will co-star in "Prince of Motor City," a "Hamlet"-inspired drama co-written by "Old Christine's" Hamish Linklater. She'll play a board member of the car company at the center of the series.

Over at CBS, Hollander has joined "The Meant to Be's," about a dead woman (Amy Smart) who must return to Earth and help people get their lives back on track before she can escape limbo. Hollander ("Gosford Park," "Pirates of the Caribbean: At World's End") will play the rule-bending head of heaven's Fate office.