The Funtastic World of Hanna-Barbera was a 90-minute anthology block that aired from 1985-95 in syndication. One of the first series in the block was Yogi's Treasure Hunt, which brought Yogi Bear together with most of the same cast from 1973's Yogi's Gang, but instead of a different villain each week, Yogi had a regular arch-foe in Wacky Races villain Dick Dastardly and his sidekick, Muttley.
Treasure Hunt was, in effect, a sequel to Yogi's Gang, but this time, Yogi was getting his marching orders from Top Cat (Arnold Stang). The series lasted three seasons, with the final episode debuting in March of 1988. That last episode, "Secret Agent Bear", allowed for the cast to engage in a little role-play, save for Dastardly & Muttley, who were their usual selves, in a parody of the James Bond movies.
Here's the open:
For what it's worth, the block's theme song, "It's Fun-fun-funtastic!" was sung by former Sha Na Na frontman Jon "Bowzer" Bauman, who was doing some voice acting for H-B at the time, in addition to working for VH1 as a VJ.
Regrettably, Cartoon Network and Boomerang have not seen fit to put Treasure Hunt on their schedule, even in the run-up to last winter's "Yogi Bear" feature film. Their loss, as usual.