Alan Alda, who won five Emmys while starring in television's "M*A*S*H" series, will return to the small screen after six years of making movies.

Alda will lead the cast of a new one-hour NBC-TV series scheduled for broadcast in the 1990 season under executive producer Martin Bregman.The as yet untitled series will be written by Vince Patrick, who wrote the novel and screenplay for "The Pope of Greenwich Village."

-Michael Caine will star in "A Shock to the System," described by Frank Perry, president of Corsair Pictures, as a stylish thriller.

Jan Egleson will direct "Shock," from a screenplay by mystery writer Andrew Klavan, on locations in New York and Connecticut beginning May 9.

Caine will play an ambitious advertising executive whose mind turns to murder when he is passed over for a job promotion he had been expecting for years.

-Two established motion picture performers, Christine Lahti and Jeff Daniels, have been lured to television to star in "Homeless," a two-hour film for CBS-TV.

Lahti and Daniels play a young couple with two small children who lose their jobs in a large American city and then lose their home in an apartment building fire. They are forced to enter the city's shelter system.

When Daniels' character leaves town to seek employment elsewhere, his wife and children join the city's "invisible population" living in the streets.

-Amy Irving will star in "Show of Force," based on Ann Nelson's book "Murder Under Two Flags," the true story of an American TV reporter's account of a political conspiracy in Puerto Rico.

The $12 million Golden Harvest Films production will begin shooting on locations in San Juan, Puerto Rico, June 14 with a cast that includes Robert Duvall, Andy Garcia and Lou Diamond Phillips.

-"I Know My First Name Is Steven" is the title for a two-part NBC-TV miniseries relating the true story of Steven Stayner, kidnapped at age 7 and reunited with his family seven years later.

The drama deals principally with the difficulties the boy encounters in adjusting to a life he had long forgotten after escaping from his abductor.

The four-hour miniseries stars Cindy Pickett and John Ashton as Steven's parents and Corin "Corky" Nemec as the teenage Steven.