'Scavenger Hunt' by Peter Allan Fields

When Mark and the crew of the Cetacean are sent to find five missing canisters of poisonous gas, they soon re-encounter the conman called Jack Muldoon. With the aid of a tame, two-headed sea monster named Oscar, Muldoon has tricked the natives of a nearby island into ‘sacrificing’ young girls to him…

Patrick Duffy (Mark Harris), Belinda Montgomery (Doctor Elizabeth Merrill), Alan Fudge (C.W. Crawford), Robert Lussier (Brent), Richard Williams (Jomo), J. Victor Lopez (Chuey), Jean Marie Hon (Jane), Anson Downes (Allen), Eugenia Wright (Trivi), Yabo O'Brien (Toba), Tony Urbano (Oscar), Ted Cassidy (Canja), Ted Neeley (Jack Muldoon), Peter Kwong (TBC)

Directed by David Moessinger
Produced by Herman Miller

Executive Producer Herbert F. Solow

TX (US): 18th April 1978

Notes:
*Featuring Mark Harris, Doctor Elizabeth Merrill and C.W. Crawford