After spending 4 years working for DePatie-Freleng & 20th Century Fox, Joe Ruby & Ken Spears returned to Hanna-Barbera in 1976, and created two new series, both of which ended up on ABC. Dynomutt was a superhero parody that was a cross-satire of both Batman (represented by Dyno's owner/partner, the Blue Falcon) and The Six Million Dollar Man, a popular prime-time series on the network at the time. Superherocartoonsite uploaded the open, "sung", if you will, by the Falcon (Gary Owens, Space Ghost), to YouTube:
There were a few crossovers with Scooby-Doo, who came over to ABC from CBS that same year, and the very next year, Scooby, Dyno, & the Falcon were all on the same team for Scooby's All-Star Laff-a-Lympics.
Dynomutt & Blue Falcon experienced a bit of a comeback in the late 90's when they made a guest appearance on Cartoon Network's Dexter's Laboratory. I guess this was in response to Scooby & Mystery Inc. popping up on Johnny Bravo. Unfortunately, WB hasn't seen fit to have Scooby & Dyno meet again, even though Dyno's 35th anniversary is coming next year.