From Wikipedia:
The Hour of Power is a weekly American Christian television program, previously hosted by Robert A. Schuller with his father, Robert H. Schuller, and broadcast from the Crystal Cathedral in Garden Grove, California. The show is normally one hour long, but some networks broadcast an edited 30 minute program. It features a large congregation, (mostly Christian) music with live orchestra and choir, and guests (frequently celebrities) who talk about how God has changed their lives for the better.
The program first aired in 1970 as a church service of the Garden Grove Community Church. It was originally hosted by the elder Schuller; the younger Schuller co-hosted it from 1976–2008.