THE gang’s all here – nearly 40 years later!

Dick Van Dyke, Mary Tyler Moore, Rose Marie, Carl Reiner and other stars of the original “Dick Van Dyke Show” have reunited for the show’s “159th Episode,” airing May 11 on CBS.

The last time “The Dick Van Dyke Show” aired an original episode was in 1966 – when Lyndon Johnson was president and The Beatles were releasing “Revolver.”

Now Reiner, who created the show, has written a new episode starring the surviving cast members (Morey Amsterdam, who played comedy writer Buddy Sorrell, died in 1996).

In the new episode, set in the present-day, Rob Petrie (Van Dyke), who’s still married to Laura (Moore), gets a phone call from his old boss, prickly Alan Brady (Reiner).

Brady wants Rob and his comedy-writing partner, Sally (Marie) to write his eulogy – figuring that, this way, he’ll know what people will say about him when he dies.

“Everybody Loves Raymond” star Ray Romano will host the episode, which also features “Dick Van Dyke Show” regulars Larry Mathews (Richie), Ann Morgan Guilbert (Millie Helper) and guest stars Jerry Van Dyke (Stacey Petrie) and Bill Idelson (Herman Glimcher).

The original “Dick Van Dyke Show” ran on CBS from 1961-66. Clips from that series will be featured on the “159th Episode.”