Thunder Bunny also had a one-shot appearance in Pep #393.
Story continues in Thunderbunny (WaRP Graphics, 1985 series) #1.
On page three, a kid is seen reading a Thunder Bunny issue with Doctor Fog on the cover. Despite the Red Circle logo on its cover, Doctor Fog did not appear until Thunderbunny (WaRP Graphics, 1985 series) #2.