Perhaps the most noteworthy installment was issue 22 when Sabrina the Teenage Witch was introduced, with art by Archie mainstay Dan DeCarlo.
Madhouse then returned to the series' irregular, nonsensical style before finally being discontinued.
In the late 1960s, the comic went through a major overhaul due to the impact of hippies, mods and rock and roll on popular culture.
Other characters included the brothers' frustrated father Mr. Didit; a narcissistic, fashion-obsessed mod known as Rod "the Mod" Roman; Bippy the Hippie, a weird, freaked-out hippie; the band's crazed groupie, Fran the Fan, who dated both Clyde and Rod; and Fran's blonde friend Annette.
As the series progressed, Dippy and Dan were relegated to supporting roles, while Fran and Rod grew in prominence.
Dick, however, being Clyde's best friend, remained as involved in the storylines as ever until the gang was dropped from the series.