He appeared on The Tonight Show several times, a CBS special called, The Nut House and an NBC special called The Future Lies Ahead while also appearing in night clubs and theaters in Las Vegas, New York City, Chicago and Los Angeles with entertainers including Frank Sinatra, Peggy Lee, Lena Horne, Ella Fitzgerald to name but a few.
[1] At an engagement at New York's Copacabana, a producer for an advertising agency approached Len and asked him if he would be willing to do some of the voices in his act on a series of commercials.
Two days later, a representative of the agency called back and apologized for the error and said they would send Len the rest.
He supplied the voices of Karate and The Chief in the children's cartoon series Batfink, and the judge in the animated feature Hugo the Hippo.
He was also the voice of the color analyst Nick Diamond in the MTV animated series Celebrity Deathmatch from 1998-2002.
This album entertained families for decades with its head-on collision of classic movie monsters with traditional Christmas observances.